diff --git a/src/model.ts b/src/model.ts
index 4a37fddf8..60c7f486e 100644
--- a/src/model.ts
+++ b/src/model.ts
@@ -8,4 +8,39 @@ interface Subtheme {
   name: string
 }
 
-export type { Theme, Subtheme }
+interface Request {
+  method: string
+  url: string
+  data?: Record<string, any>
+}
+
+interface Response {
+  status: number
+  data?: Record<string, any>
+  error?: { message: string }
+}
+
+interface DiscussionParams {
+  title: string
+  comment: string
+  subject: DiscussionSubject
+}
+
+interface DiscussionSubject {
+  class: 'Topic'
+  id: string
+}
+
+interface DiscussionResponse extends Response {
+  status: 200 | number
+  data?: Partial<DiscussionParams>
+}
+
+export type {
+  Theme,
+  Subtheme,
+  Request,
+  Response,
+  DiscussionParams,
+  DiscussionResponse
+}
diff --git a/src/services/api/DatagouvfrAPI.js b/src/services/api/DatagouvfrAPI.ts
similarity index 77%
rename from src/services/api/DatagouvfrAPI.js
rename to src/services/api/DatagouvfrAPI.ts
index ef463def4..1fa4c2abf 100644
--- a/src/services/api/DatagouvfrAPI.js
+++ b/src/services/api/DatagouvfrAPI.ts
@@ -3,7 +3,9 @@ import { toast } from 'vue3-toastify'
 import { useLoading } from 'vue-loading-overlay'
 
 import config from '@/config'
+import type { Response } from '@/model'
 
+// FIXME: the client should not depend be aware of the store.
 import { useUserStore } from '../../store/UserStore'
 
 const $loading = useLoading()
@@ -21,7 +23,7 @@ instance.interceptors.request.use(
 
     return config
   },
-  (error) => Promise.reject(error)
+  async (error) => await Promise.reject(error)
 )
 
 /**
@@ -73,14 +75,16 @@ export default class DatagouvfrAPI {
    */
   async makeRequestAndHandleResponse(url, method = 'get', params = {}) {
     const loader = $loading.show()
-    return this.request(url, method, params)
+    return await this.request(url, method, params)
       .catch((error) => {
-        if (error && error.message) {
+        if (error?.message) {
           toast(error.message, { type: 'error', autoClose: false }) // TODO: Refacto to handle the error
           return error.response
         }
       })
-      .finally(() => loader.hide())
+      .finally(() => {
+        loader.hide()
+      })
   }
 
   /**
@@ -141,6 +145,23 @@ export default class DatagouvfrAPI {
     )
   }
 
+  /**
+   * Base function for HTTP calls (without error handling)
+   *
+   * @todo Remove this function once all API calls are all handled this way:
+   *       leaving the error handling to the caller (store).
+   *
+   * @param {string} url
+   * @param {object} data
+   * @returns {Promise<Response>}
+   */
+  async _create(url: string, data = {}): Promise<Response> {
+    return await this.httpClient.post(url, data).then(
+      (response) => response,
+      (error) => this.#handleError(error)
+    )
+  }
+
   /**
    * Update an entity (PUT)
    *
@@ -160,17 +181,19 @@ export default class DatagouvfrAPI {
    * Delete an entity (DELETE)
    *
    * @param {string} entityId - A UUID entity id
-   * @returns {Promise}
+   * @returns {Promise<Response>}
    */
-  async delete(entityId) {
-    return this.httpClient.delete(`${this.url()}/${entityId}/`).then(
+  async delete(entityId: string): Promise<Response> {
+    return await this.httpClient.delete(`${this.url()}/${entityId}/`).then(
       (response) => response,
       (error) => this.#handleError(error)
     )
   }
 
-  #handleError({ response, message }) {
-    if (response) return { status: response.status }
-    return { message }
+  #handleError({ response, message }): Response {
+    return {
+      ...(response && { status: response.status }),
+      ...(message && { error: { message } })
+    }
   }
 }
diff --git a/src/services/api/__tests__/DatagouvfrAPI.test.js b/src/services/api/__tests__/DatagouvfrAPI.test.js
index 74d751de4..fdafe271e 100644
--- a/src/services/api/__tests__/DatagouvfrAPI.test.js
+++ b/src/services/api/__tests__/DatagouvfrAPI.test.js
@@ -80,8 +80,8 @@ test('delete when 404', async ({ client }) => {
 })
 
 test('delete something else', async ({ client }) => {
-  const { message } = await client.delete(networkError)
-  expect(message).toMatch(/network error/i)
+  const { error } = await client.delete(networkError)
+  expect(error.message).toMatch(/network error/i)
 })
 
 test('raw list', async ({ client }) => {
diff --git a/src/services/api/__tests__/DiscussionsAPI.test.js b/src/services/api/__tests__/DiscussionsAPI.test.js
new file mode 100644
index 000000000..9269d7bfb
--- /dev/null
+++ b/src/services/api/__tests__/DiscussionsAPI.test.js
@@ -0,0 +1,61 @@
+import axios from 'axios'
+import { HttpResponse, http } from 'msw'
+import { setupServer } from 'msw/node'
+import { createPinia, setActivePinia } from 'pinia'
+import {
+  afterAll,
+  afterEach,
+  beforeAll,
+  beforeEach,
+  expect,
+  test
+} from 'vitest'
+
+import DiscussionsAPI from '@/services/api/resources/DiscussionsAPI'
+
+const baseUrl = 'https://example.lol'
+const version = '1234'
+const endpoint = 'discussions'
+
+const discussionRequest = {
+  title: 'Title of the discussion',
+  comment: 'This is a discussion.',
+  subject: {
+    class: 'Topic',
+    id: 'id123'
+  }
+}
+
+const server = setupServer(
+  http.post(`${baseUrl}/${version}/${endpoint}/`, () => {
+    return HttpResponse.json(discussionRequest, { status: 200 })
+  })
+)
+
+beforeAll(() => {
+  server.listen()
+})
+
+beforeEach(async (context) => {
+  const httpClient = axios.create()
+  httpClient.defaults.proxy = false
+  setActivePinia(createPinia())
+  context.client = new DiscussionsAPI({
+    baseUrl,
+    version,
+    httpClient
+  })
+})
+
+afterEach(() => {
+  server.resetHandlers()
+})
+
+afterAll(() => {
+  server.close()
+})
+
+test('create a discussion', async ({ client }) => {
+  const { data } = await client.create(discussionRequest)
+  expect(data.title).toEqual(discussionRequest.title)
+})
diff --git a/src/services/api/resources/DiscussionsAPI.js b/src/services/api/resources/DiscussionsAPI.ts
similarity index 57%
rename from src/services/api/resources/DiscussionsAPI.js
rename to src/services/api/resources/DiscussionsAPI.ts
index 6d94e4ecd..fad5ada72 100644
--- a/src/services/api/resources/DiscussionsAPI.js
+++ b/src/services/api/resources/DiscussionsAPI.ts
@@ -1,3 +1,5 @@
+import type { DiscussionParams, DiscussionResponse } from '@/model'
+
 import DatagouvfrAPI from '../DatagouvfrAPI'
 
 export default class DiscussionsAPI extends DatagouvfrAPI {
@@ -14,4 +16,14 @@ export default class DiscussionsAPI extends DatagouvfrAPI {
     const url = `${this.url()}/?for=${dataset_id}&page=${page}`
     return await this.makeRequestAndHandleResponse(url)
   }
+
+  /**
+   * Create a discussion (POST)
+   *
+   * @param {DiscussionParams} data
+   * @returns {Promise<DiscussionResponse>}
+   */
+  async create(data: DiscussionParams): Promise<DiscussionResponse> {
+    return await this._create(`${this.url()}/`, data)
+  }
 }