diff --git a/package-lock.json b/package-lock.json
index e0c8632..d0ef608 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
     "name": "@doist/todoist-api-typescript",
-    "version": "1.6.0",
+    "version": "1.7.0",
     "lockfileVersion": 2,
     "requires": true,
     "packages": {
         "": {
             "name": "@doist/todoist-api-typescript",
-            "version": "1.6.0",
+            "version": "1.7.0",
             "license": "MIT",
             "dependencies": {
                 "axios": "^0.27.0",
diff --git a/package.json b/package.json
index 79f9f5d..a490018 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@doist/todoist-api-typescript",
-    "version": "1.6.0",
+    "version": "1.7.0",
     "description": "A typescript wrapper for the Todoist REST API.",
     "author": "Doist developers",
     "repository": "git@github.com:doist/todoist-api-typescript.git",
diff --git a/src/TodoistApi.comments.test.ts b/src/TodoistApi.comments.test.ts
index a6ac8f9..457af60 100644
--- a/src/TodoistApi.comments.test.ts
+++ b/src/TodoistApi.comments.test.ts
@@ -5,7 +5,7 @@ import {
     DEFAULT_REQUEST_ID,
     INVALID_ENTITY_ID,
 } from './testUtils/testDefaults'
-import { API_REST_BASE_URI, ENDPOINT_REST_COMMENTS } from './consts/endpoints'
+import { getRestBaseUri, ENDPOINT_REST_COMMENTS } from './consts/endpoints'
 import { setupRestClientMock } from './testUtils/mocks'
 import { assertInputValidationError } from './testUtils/asserts'
 
@@ -25,7 +25,7 @@ describe('TodoistApi comment endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'GET',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 ENDPOINT_REST_COMMENTS,
                 DEFAULT_AUTH_TOKEN,
                 getCommentsArgs,
@@ -54,7 +54,7 @@ describe('TodoistApi comment endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'GET',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 `${ENDPOINT_REST_COMMENTS}/${commentId}`,
                 DEFAULT_AUTH_TOKEN,
             )
@@ -92,7 +92,7 @@ describe('TodoistApi comment endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'POST',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 ENDPOINT_REST_COMMENTS,
                 DEFAULT_AUTH_TOKEN,
                 addCommentArgs,
@@ -126,7 +126,7 @@ describe('TodoistApi comment endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'POST',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 `${ENDPOINT_REST_COMMENTS}/${taskId}`,
                 DEFAULT_AUTH_TOKEN,
                 updateCommentArgs,
@@ -161,7 +161,7 @@ describe('TodoistApi comment endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'DELETE',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 `${ENDPOINT_REST_COMMENTS}/${taskId}`,
                 DEFAULT_AUTH_TOKEN,
                 undefined,
diff --git a/src/TodoistApi.labels.test.ts b/src/TodoistApi.labels.test.ts
index 3a18f39..186abaa 100644
--- a/src/TodoistApi.labels.test.ts
+++ b/src/TodoistApi.labels.test.ts
@@ -5,7 +5,7 @@ import {
     DEFAULT_REQUEST_ID,
     INVALID_ENTITY_ID,
 } from './testUtils/testDefaults'
-import { API_REST_BASE_URI, ENDPOINT_REST_LABELS } from './consts/endpoints'
+import { getRestBaseUri, ENDPOINT_REST_LABELS } from './consts/endpoints'
 import { setupRestClientMock } from './testUtils/mocks'
 import { assertInputValidationError } from './testUtils/asserts'
 
@@ -25,7 +25,7 @@ describe('TodoistApi label endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'GET',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 `${ENDPOINT_REST_LABELS}/${labelId}`,
                 DEFAULT_AUTH_TOKEN,
             )
@@ -57,7 +57,7 @@ describe('TodoistApi label endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'GET',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 ENDPOINT_REST_LABELS,
                 DEFAULT_AUTH_TOKEN,
             )
@@ -88,7 +88,7 @@ describe('TodoistApi label endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'POST',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 ENDPOINT_REST_LABELS,
                 DEFAULT_AUTH_TOKEN,
                 DEFAULT_ADD_LABEL_ARGS,
@@ -121,7 +121,7 @@ describe('TodoistApi label endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'POST',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 `${ENDPOINT_REST_LABELS}/${labelId}`,
                 DEFAULT_AUTH_TOKEN,
                 DEFAULT_UPDATE_LABEL_ARGS,
@@ -157,7 +157,7 @@ describe('TodoistApi label endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'DELETE',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 `${ENDPOINT_REST_LABELS}/${labelId}`,
                 DEFAULT_AUTH_TOKEN,
                 undefined,
diff --git a/src/TodoistApi.projects.test.ts b/src/TodoistApi.projects.test.ts
index 2e9d61b..82fd5b2 100644
--- a/src/TodoistApi.projects.test.ts
+++ b/src/TodoistApi.projects.test.ts
@@ -7,7 +7,7 @@ import {
     INVALID_ENTITY_ID,
 } from './testUtils/testDefaults'
 import {
-    API_REST_BASE_URI,
+    getRestBaseUri,
     ENDPOINT_REST_PROJECTS,
     ENDPOINT_REST_PROJECT_COLLABORATORS,
 } from './consts/endpoints'
@@ -30,7 +30,7 @@ describe('TodoistApi project endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'GET',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 `${ENDPOINT_REST_PROJECTS}/${projectId}`,
                 DEFAULT_AUTH_TOKEN,
             )
@@ -62,7 +62,7 @@ describe('TodoistApi project endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'GET',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 ENDPOINT_REST_PROJECTS,
                 DEFAULT_AUTH_TOKEN,
             )
@@ -93,7 +93,7 @@ describe('TodoistApi project endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'POST',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 ENDPOINT_REST_PROJECTS,
                 DEFAULT_AUTH_TOKEN,
                 DEFAULT_ADD_PROJECT_ARGS,
@@ -123,7 +123,7 @@ describe('TodoistApi project endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'POST',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 `${ENDPOINT_REST_PROJECTS}/${projectId}`,
                 DEFAULT_AUTH_TOKEN,
                 updateArgs,
@@ -158,7 +158,7 @@ describe('TodoistApi project endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'DELETE',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 `${ENDPOINT_REST_PROJECTS}/${projectId}`,
                 DEFAULT_AUTH_TOKEN,
                 DEFAULT_REQUEST_ID,
@@ -194,7 +194,7 @@ describe('TodoistApi project endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'GET',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 `${ENDPOINT_REST_PROJECTS}/${projectId}/${ENDPOINT_REST_PROJECT_COLLABORATORS}`,
                 DEFAULT_AUTH_TOKEN,
             )
diff --git a/src/TodoistApi.sections.test.ts b/src/TodoistApi.sections.test.ts
index 95d4a42..771c607 100644
--- a/src/TodoistApi.sections.test.ts
+++ b/src/TodoistApi.sections.test.ts
@@ -5,7 +5,7 @@ import {
     DEFAULT_SECTION,
     INVALID_ENTITY_ID,
 } from './testUtils/testDefaults'
-import { API_REST_BASE_URI, ENDPOINT_REST_SECTIONS } from './consts/endpoints'
+import { getRestBaseUri, ENDPOINT_REST_SECTIONS } from './consts/endpoints'
 import { setupRestClientMock } from './testUtils/mocks'
 import { assertInputValidationError } from './testUtils/asserts'
 
@@ -25,7 +25,7 @@ describe('TodoistApi section endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'GET',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 `${ENDPOINT_REST_SECTIONS}/${sectionId}`,
                 DEFAULT_AUTH_TOKEN,
             )
@@ -58,7 +58,7 @@ describe('TodoistApi section endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'GET',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 ENDPOINT_REST_SECTIONS,
                 DEFAULT_AUTH_TOKEN,
                 { projectId },
@@ -91,7 +91,7 @@ describe('TodoistApi section endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'POST',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 ENDPOINT_REST_SECTIONS,
                 DEFAULT_AUTH_TOKEN,
                 DEFAULT_ADD_SECTION_ARGS,
@@ -121,7 +121,7 @@ describe('TodoistApi section endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'POST',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 `${ENDPOINT_REST_SECTIONS}/${sectionId}`,
                 DEFAULT_AUTH_TOKEN,
                 updateArgs,
@@ -157,7 +157,7 @@ describe('TodoistApi section endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'DELETE',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 `${ENDPOINT_REST_SECTIONS}/${sectionId}`,
                 DEFAULT_AUTH_TOKEN,
                 undefined,
diff --git a/src/TodoistApi.tasks.test.ts b/src/TodoistApi.tasks.test.ts
index e1ccd87..cd0e23c 100644
--- a/src/TodoistApi.tasks.test.ts
+++ b/src/TodoistApi.tasks.test.ts
@@ -9,8 +9,8 @@ import {
     INVALID_ENTITY_ID,
 } from './testUtils/testDefaults'
 import {
-    API_REST_BASE_URI,
-    API_SYNC_BASE_URI,
+    getRestBaseUri,
+    getSyncBaseUri,
     ENDPOINT_REST_TASK_CLOSE,
     ENDPOINT_REST_TASK_REOPEN,
     ENDPOINT_REST_TASKS,
@@ -23,8 +23,8 @@ function setupSyncTaskConverter(returnedTask: Task) {
     return jest.spyOn(taskConverters, 'getTaskFromQuickAddResponse').mockReturnValue(returnedTask)
 }
 
-function getTarget() {
-    return new TodoistApi(DEFAULT_AUTH_TOKEN)
+function getTarget(baseUrl = 'https://api.todoist.com') {
+    return new TodoistApi(DEFAULT_AUTH_TOKEN, baseUrl)
 }
 
 describe('TodoistApi task endpoints', () => {
@@ -42,7 +42,24 @@ describe('TodoistApi task endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'POST',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
+                ENDPOINT_REST_TASKS,
+                DEFAULT_AUTH_TOKEN,
+                DEFAULT_ADD_TASK_ARGS,
+                DEFAULT_REQUEST_ID,
+            )
+        })
+
+        test('calls post on restClient with expected parameters against staging', async () => {
+            const requestMock = setupRestClientMock(DEFAULT_TASK)
+            const api = getTarget('https://staging.todoist.com')
+
+            await api.addTask(DEFAULT_ADD_TASK_ARGS, DEFAULT_REQUEST_ID)
+
+            expect(requestMock).toBeCalledTimes(1)
+            expect(requestMock).toBeCalledWith(
+                'POST',
+                getRestBaseUri('https://staging.todoist.com'),
                 ENDPOINT_REST_TASKS,
                 DEFAULT_AUTH_TOKEN,
                 DEFAULT_ADD_TASK_ARGS,
@@ -72,7 +89,7 @@ describe('TodoistApi task endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'POST',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 `${ENDPOINT_REST_TASKS}/${taskId}`,
                 DEFAULT_AUTH_TOKEN,
                 updateArgs,
@@ -108,7 +125,7 @@ describe('TodoistApi task endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'POST',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 `${ENDPOINT_REST_TASKS}/${taskId}/${ENDPOINT_REST_TASK_CLOSE}`,
                 DEFAULT_AUTH_TOKEN,
                 undefined,
@@ -143,7 +160,7 @@ describe('TodoistApi task endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'POST',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 `${ENDPOINT_REST_TASKS}/${taskId}/${ENDPOINT_REST_TASK_REOPEN}`,
                 DEFAULT_AUTH_TOKEN,
                 undefined,
@@ -178,7 +195,7 @@ describe('TodoistApi task endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'DELETE',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 `${ENDPOINT_REST_TASKS}/${taskId}`,
                 DEFAULT_AUTH_TOKEN,
                 undefined,
@@ -219,7 +236,7 @@ describe('TodoistApi task endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'POST',
-                API_SYNC_BASE_URI,
+                getSyncBaseUri(),
                 ENDPOINT_SYNC_QUICK_ADD,
                 DEFAULT_AUTH_TOKEN,
                 DEFAULT_QUICK_ADD_ARGS,
@@ -250,7 +267,7 @@ describe('TodoistApi task endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'GET',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 `${ENDPOINT_REST_TASKS}/${taskId}`,
                 DEFAULT_AUTH_TOKEN,
             )
@@ -277,7 +294,7 @@ describe('TodoistApi task endpoints', () => {
             expect(requestMock).toBeCalledTimes(1)
             expect(requestMock).toBeCalledWith(
                 'GET',
-                API_REST_BASE_URI,
+                getRestBaseUri(),
                 ENDPOINT_REST_TASKS,
                 DEFAULT_AUTH_TOKEN,
                 DEFAULT_GET_TASKS_ARGS,
diff --git a/src/TodoistApi.ts b/src/TodoistApi.ts
index 944af95..8b2d1a7 100644
--- a/src/TodoistApi.ts
+++ b/src/TodoistApi.ts
@@ -28,8 +28,8 @@ import {
 import { request, isSuccess } from './restClient'
 import { getTaskFromQuickAddResponse } from './utils/taskConverters'
 import {
-    API_REST_BASE_URI,
-    API_SYNC_BASE_URI,
+    getRestBaseUri,
+    getSyncBaseUri,
     ENDPOINT_REST_TASKS,
     ENDPOINT_REST_PROJECTS,
     ENDPOINT_SYNC_QUICK_ADD,
@@ -66,15 +66,21 @@ function generatePath(...segments: string[]): string {
 export class TodoistApi {
     authToken: string
 
-    constructor(authToken: string) {
+    constructor(authToken: string, baseUrl?: string) {
         this.authToken = authToken
+
+        this.restApiBase = getRestBaseUri(baseUrl)
+        this.syncApiBase = getSyncBaseUri(baseUrl)
     }
 
+    private restApiBase: string
+    private syncApiBase: string
+
     async getTask(id: number): Promise<Task> {
         Int.check(id)
         const response = await request<Task>(
             'GET',
-            API_REST_BASE_URI,
+            this.restApiBase,
             generatePath(ENDPOINT_REST_TASKS, String(id)),
             this.authToken,
         )
@@ -85,7 +91,7 @@ export class TodoistApi {
     async getTasks(args?: GetTasksArgs): Promise<Task[]> {
         const response = await request<Task[]>(
             'GET',
-            API_REST_BASE_URI,
+            this.restApiBase,
             ENDPOINT_REST_TASKS,
             this.authToken,
             args,
@@ -97,7 +103,7 @@ export class TodoistApi {
     async addTask(args: AddTaskArgs, requestId?: string): Promise<Task> {
         const response = await request<Task>(
             'POST',
-            API_REST_BASE_URI,
+            this.restApiBase,
             ENDPOINT_REST_TASKS,
             this.authToken,
             args,
@@ -110,7 +116,7 @@ export class TodoistApi {
     async quickAddTask(args: QuickAddTaskArgs): Promise<Task> {
         const response = await request<QuickAddTaskResponse>(
             'POST',
-            API_SYNC_BASE_URI,
+            this.syncApiBase,
             ENDPOINT_SYNC_QUICK_ADD,
             this.authToken,
             args,
@@ -125,7 +131,7 @@ export class TodoistApi {
         Int.check(id)
         const response = await request(
             'POST',
-            API_REST_BASE_URI,
+            this.restApiBase,
             generatePath(ENDPOINT_REST_TASKS, String(id)),
             this.authToken,
             args,
@@ -138,7 +144,7 @@ export class TodoistApi {
         Int.check(id)
         const response = await request(
             'POST',
-            API_REST_BASE_URI,
+            this.restApiBase,
             generatePath(ENDPOINT_REST_TASKS, String(id), ENDPOINT_REST_TASK_CLOSE),
             this.authToken,
             undefined,
@@ -151,7 +157,7 @@ export class TodoistApi {
         Int.check(id)
         const response = await request(
             'POST',
-            API_REST_BASE_URI,
+            this.restApiBase,
             generatePath(ENDPOINT_REST_TASKS, String(id), ENDPOINT_REST_TASK_REOPEN),
             this.authToken,
             undefined,
@@ -164,7 +170,7 @@ export class TodoistApi {
         Int.check(id)
         const response = await request(
             'DELETE',
-            API_REST_BASE_URI,
+            this.restApiBase,
             generatePath(ENDPOINT_REST_TASKS, String(id)),
             this.authToken,
             undefined,
@@ -177,7 +183,7 @@ export class TodoistApi {
         Int.check(id)
         const response = await request<Project>(
             'GET',
-            API_REST_BASE_URI,
+            this.restApiBase,
             generatePath(ENDPOINT_REST_PROJECTS, String(id)),
             this.authToken,
         )
@@ -188,7 +194,7 @@ export class TodoistApi {
     async getProjects(): Promise<Project[]> {
         const response = await request<Project[]>(
             'GET',
-            API_REST_BASE_URI,
+            this.restApiBase,
             ENDPOINT_REST_PROJECTS,
             this.authToken,
         )
@@ -199,7 +205,7 @@ export class TodoistApi {
     async addProject(args: AddProjectArgs, requestId?: string): Promise<Project> {
         const response = await request<Project>(
             'POST',
-            API_REST_BASE_URI,
+            this.restApiBase,
             ENDPOINT_REST_PROJECTS,
             this.authToken,
             args,
@@ -213,7 +219,7 @@ export class TodoistApi {
         Int.check(id)
         const response = await request(
             'POST',
-            API_REST_BASE_URI,
+            this.restApiBase,
             generatePath(ENDPOINT_REST_PROJECTS, String(id)),
             this.authToken,
             args,
@@ -226,7 +232,7 @@ export class TodoistApi {
         Int.check(id)
         const response = await request(
             'DELETE',
-            API_REST_BASE_URI,
+            this.restApiBase,
             generatePath(ENDPOINT_REST_PROJECTS, String(id)),
             this.authToken,
             requestId,
@@ -238,7 +244,7 @@ export class TodoistApi {
         Int.check(projectId)
         const response = await request<User[]>(
             'GET',
-            API_REST_BASE_URI,
+            this.restApiBase,
             generatePath(
                 ENDPOINT_REST_PROJECTS,
                 String(projectId),
@@ -253,7 +259,7 @@ export class TodoistApi {
     async getSections(projectId?: number): Promise<Section[]> {
         const response = await request<Section[]>(
             'GET',
-            API_REST_BASE_URI,
+            this.restApiBase,
             ENDPOINT_REST_SECTIONS,
             this.authToken,
             projectId && { projectId },
@@ -266,7 +272,7 @@ export class TodoistApi {
         Int.check(id)
         const response = await request<Section>(
             'GET',
-            API_REST_BASE_URI,
+            this.restApiBase,
             generatePath(ENDPOINT_REST_SECTIONS, String(id)),
             this.authToken,
         )
@@ -277,7 +283,7 @@ export class TodoistApi {
     async addSection(args: AddSectionArgs, requestId?: string): Promise<Section> {
         const response = await request<Section>(
             'POST',
-            API_REST_BASE_URI,
+            this.restApiBase,
             ENDPOINT_REST_SECTIONS,
             this.authToken,
             args,
@@ -291,7 +297,7 @@ export class TodoistApi {
         Int.check(id)
         const response = await request(
             'POST',
-            API_REST_BASE_URI,
+            this.restApiBase,
             generatePath(ENDPOINT_REST_SECTIONS, String(id)),
             this.authToken,
             args,
@@ -304,7 +310,7 @@ export class TodoistApi {
         Int.check(id)
         const response = await request(
             'DELETE',
-            API_REST_BASE_URI,
+            this.restApiBase,
             generatePath(ENDPOINT_REST_SECTIONS, String(id)),
             this.authToken,
             undefined,
@@ -317,7 +323,7 @@ export class TodoistApi {
         Int.check(id)
         const response = await request<Label>(
             'GET',
-            API_REST_BASE_URI,
+            this.restApiBase,
             generatePath(ENDPOINT_REST_LABELS, String(id)),
             this.authToken,
         )
@@ -328,7 +334,7 @@ export class TodoistApi {
     async getLabels(): Promise<Label[]> {
         const response = await request<Label[]>(
             'GET',
-            API_REST_BASE_URI,
+            this.restApiBase,
             ENDPOINT_REST_LABELS,
             this.authToken,
         )
@@ -339,7 +345,7 @@ export class TodoistApi {
     async addLabel(args: AddLabelArgs, requestId?: string): Promise<Label> {
         const response = await request<Label>(
             'POST',
-            API_REST_BASE_URI,
+            this.restApiBase,
             ENDPOINT_REST_LABELS,
             this.authToken,
             args,
@@ -353,7 +359,7 @@ export class TodoistApi {
         Int.check(id)
         const response = await request(
             'POST',
-            API_REST_BASE_URI,
+            this.restApiBase,
             generatePath(ENDPOINT_REST_LABELS, String(id)),
             this.authToken,
             args,
@@ -366,7 +372,7 @@ export class TodoistApi {
         Int.check(id)
         const response = await request(
             'DELETE',
-            API_REST_BASE_URI,
+            this.restApiBase,
             generatePath(ENDPOINT_REST_LABELS, String(id)),
             this.authToken,
             undefined,
@@ -378,7 +384,7 @@ export class TodoistApi {
     async getComments(args: GetTaskCommentsArgs | GetProjectCommentsArgs): Promise<Comment[]> {
         const response = await request<Comment[]>(
             'GET',
-            API_REST_BASE_URI,
+            this.restApiBase,
             ENDPOINT_REST_COMMENTS,
             this.authToken,
             args,
@@ -391,7 +397,7 @@ export class TodoistApi {
         Int.check(id)
         const response = await request<Comment>(
             'GET',
-            API_REST_BASE_URI,
+            this.restApiBase,
             generatePath(ENDPOINT_REST_COMMENTS, String(id)),
             this.authToken,
         )
@@ -405,7 +411,7 @@ export class TodoistApi {
     ): Promise<Comment> {
         const response = await request<Comment>(
             'POST',
-            API_REST_BASE_URI,
+            this.restApiBase,
             ENDPOINT_REST_COMMENTS,
             this.authToken,
             args,
@@ -419,7 +425,7 @@ export class TodoistApi {
         Int.check(id)
         const response = await request<boolean>(
             'POST',
-            API_REST_BASE_URI,
+            this.restApiBase,
             generatePath(ENDPOINT_REST_COMMENTS, String(id)),
             this.authToken,
             args,
@@ -432,7 +438,7 @@ export class TodoistApi {
         Int.check(id)
         const response = await request(
             'DELETE',
-            API_REST_BASE_URI,
+            this.restApiBase,
             generatePath(ENDPOINT_REST_COMMENTS, String(id)),
             this.authToken,
             undefined,
diff --git a/src/authentication.test.ts b/src/authentication.test.ts
index 05dd507..968b9fc 100644
--- a/src/authentication.test.ts
+++ b/src/authentication.test.ts
@@ -10,20 +10,36 @@ describe('authentication', () => {
                 'SomeId',
                 'SomeState',
                 ['data:read_write'] as Permission[],
+                undefined,
                 'https://todoist.com/oauth/authorize?client_id=SomeId&scope=data:read_write&state=SomeState',
             ],
             [
                 'SomeId',
                 'SomeState',
                 ['data:read', 'project:delete'] as Permission[],
+                undefined,
                 'https://todoist.com/oauth/authorize?client_id=SomeId&scope=data:read,project:delete&state=SomeState',
             ],
+            [
+                'SomeId',
+                'SomeState',
+                ['data:read_write'] as Permission[],
+                'https://staging.todoist.com',
+                'https://staging.todoist.com/oauth/authorize?client_id=SomeId&scope=data:read_write&state=SomeState',
+            ],
+            [
+                'SomeId',
+                'SomeState',
+                ['data:read', 'project:delete'] as Permission[],
+                'https://staging.todoist.com',
+                'https://staging.todoist.com/oauth/authorize?client_id=SomeId&scope=data:read,project:delete&state=SomeState',
+            ],
         ] as const
 
         test.each(authUrlTheories)(
             'Formatting %p with arguments %p returns %p',
-            (clientId, state, permissions, expected) => {
-                const url = getAuthorizationUrl(clientId, permissions, state)
+            (clientId, state, permissions, baseUrl, expected) => {
+                const url = getAuthorizationUrl(clientId, permissions, state, baseUrl)
                 expect(url).toEqual(expected)
             },
         )
diff --git a/src/authentication.ts b/src/authentication.ts
index 73c2662..7020f8f 100644
--- a/src/authentication.ts
+++ b/src/authentication.ts
@@ -2,8 +2,8 @@ import { request, isSuccess } from './restClient'
 import { v4 as uuid } from 'uuid'
 import { TodoistRequestError } from './types'
 import {
-    API_AUTHORIZATION_BASE_URI,
-    API_SYNC_BASE_URI,
+    getAuthBaseUri,
+    getSyncBaseUri,
     ENDPOINT_AUTHORIZATION,
     ENDPOINT_GET_TOKEN,
     ENDPOINT_REVOKE_TOKEN,
@@ -41,19 +41,25 @@ export function getAuthorizationUrl(
     clientId: string,
     permissions: Permission[],
     state: string,
+    baseUrl?: string,
 ): string {
     if (!permissions?.length) {
         throw new Error('At least one scope value should be passed for permissions.')
     }
 
     const scope = permissions.join(',')
-    return `${API_AUTHORIZATION_BASE_URI}${ENDPOINT_AUTHORIZATION}?client_id=${clientId}&scope=${scope}&state=${state}`
+    return `${getAuthBaseUri(
+        baseUrl,
+    )}${ENDPOINT_AUTHORIZATION}?client_id=${clientId}&scope=${scope}&state=${state}`
 }
 
-export async function getAuthToken(args: AuthTokenRequestArgs): Promise<AuthTokenResponse> {
+export async function getAuthToken(
+    args: AuthTokenRequestArgs,
+    baseUrl?: string,
+): Promise<AuthTokenResponse> {
     const response = await request<AuthTokenResponse>(
         'POST',
-        API_AUTHORIZATION_BASE_URI,
+        getAuthBaseUri(baseUrl),
         ENDPOINT_GET_TOKEN,
         undefined,
         args,
@@ -70,10 +76,13 @@ export async function getAuthToken(args: AuthTokenRequestArgs): Promise<AuthToke
     return response.data
 }
 
-export async function revokeAuthToken(args: RevokeAuthTokenRequestArgs): Promise<boolean> {
+export async function revokeAuthToken(
+    args: RevokeAuthTokenRequestArgs,
+    baseUrl?: string,
+): Promise<boolean> {
     const response = await request(
         'POST',
-        API_SYNC_BASE_URI,
+        getSyncBaseUri(baseUrl),
         ENDPOINT_REVOKE_TOKEN,
         undefined,
         args,
diff --git a/src/consts/endpoints.ts b/src/consts/endpoints.ts
index e5de8b6..3f15318 100644
--- a/src/consts/endpoints.ts
+++ b/src/consts/endpoints.ts
@@ -1,6 +1,20 @@
-export const API_REST_BASE_URI = 'https://api.todoist.com/rest/v1/'
-export const API_SYNC_BASE_URI = 'https://api.todoist.com/sync/v8/'
-export const API_AUTHORIZATION_BASE_URI = 'https://todoist.com/oauth/'
+const BASE_URI = 'https://api.todoist.com'
+const API_REST_BASE_URI = '/rest/v1/'
+const API_SYNC_BASE_URI = '/sync/v8/'
+const TODOIST_URI = 'https://todoist.com'
+const API_AUTHORIZATION_BASE_URI = '/oauth/'
+
+export function getRestBaseUri(domainBase: string = BASE_URI): string {
+    return new URL(API_REST_BASE_URI, domainBase).toString()
+}
+
+export function getSyncBaseUri(domainBase: string = BASE_URI): string {
+    return new URL(API_SYNC_BASE_URI, domainBase).toString()
+}
+
+export function getAuthBaseUri(domainBase: string = TODOIST_URI): string {
+    return new URL(API_AUTHORIZATION_BASE_URI, domainBase).toString()
+}
 
 export const ENDPOINT_REST_TASKS = 'tasks'
 export const ENDPOINT_REST_PROJECTS = 'projects'