> ## Documentation Index
> Fetch the complete documentation index at: https://mintlify.com/RafaeltiMoreira/mais-habito-api/llms.txt
> Use this file to discover all available pages before exploring further.

# Accept challenge

> Accept a challenge template and start it as an active challenge.

<Badge color="green">POST</Badge> `/api/user-challenges/accept`

Requires authentication.

<ParamField header="Authorization" type="string" required>
  Bearer token obtained from `/api/auth/login` or `/api/auth/signup`. Format: `Bearer <token>`.
</ParamField>

<Warning>
  Only **one active challenge** is allowed at a time. Attempting to accept a new challenge while
  one is already active returns a `400` error. Complete or abandon your current challenge before
  starting a new one.
</Warning>

## Request body

<ParamField body="templateId" type="number" required>
  The numeric ID of the challenge template to accept.
</ParamField>

## Example

<CodeGroup>
  ```bash cURL theme={null}
  curl --request POST \
    --url http://localhost:3000/api/user-challenges/accept \
    --header 'Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...' \
    --header 'Content-Type: application/json' \
    --data '{
      "templateId": 3
    }'
  ```
</CodeGroup>

## Response

**201 Created**

Returns the newly created user challenge object with status `ACTIVE`.

<ResponseField name="id" type="number" required>
  Unique numeric identifier for this user challenge.
</ResponseField>

<ResponseField name="user_id" type="string" required>
  UUID of the authenticated user who accepted the challenge.
</ResponseField>

<ResponseField name="template_id" type="number" required>
  ID of the challenge template this challenge is based on.
</ResponseField>

<ResponseField name="status" type="string" required>
  Current status of the challenge. Always `ACTIVE` on creation.
</ResponseField>

<ResponseField name="start_date" type="string" required>
  ISO 8601 timestamp of when the challenge was started.
</ResponseField>

<ResponseField name="completed_at" type="string">
  ISO 8601 timestamp of when the challenge was completed. `null` for active challenges.
</ResponseField>

<ResponseField name="notes" type="string">
  Progress notes for the challenge. `null` if no notes have been added.
</ResponseField>

<ResponseField name="created_at" type="string" required>
  ISO 8601 timestamp of when the record was created.
</ResponseField>

<ResponseField name="updated_at" type="string" required>
  ISO 8601 timestamp of the last update to this record.
</ResponseField>

```json Example response theme={null}
{
  "id": 14,
  "user_id": "a3f2c1d0-89b4-4e7a-b6f5-1234567890ab",
  "template_id": 3,
  "status": "ACTIVE",
  "start_date": "2026-03-17T09:00:00.000Z",
  "completed_at": null,
  "notes": null,
  "created_at": "2026-03-17T09:00:00.000Z",
  "updated_at": "2026-03-17T09:00:00.000Z"
}
```

## Errors

| Status | Description                                                                             |
| ------ | --------------------------------------------------------------------------------------- |
| `400`  | The user already has an active challenge. Message: `"Você já possui um desafio ativo"`. |
| `401`  | Missing, invalid, or expired token.                                                     |
| `404`  | No challenge template found with the given `templateId`.                                |