> ## Documentation Index
> Fetch the complete documentation index at: https://developers.criteo.com/llms.txt
> Use this file to discover all available pages before exploring further.

# API Pattern

# Base URL

<CodeGroup>
  ```http URL theme={null}
  https://api.criteo.com/<version>/retail-media/{endpoint}
  ```
</CodeGroup>

***

# Synchronous Endpoints

All campaign operations except for Catalogs are achieved through synchronous endpoints. Those will return a response in real-time.

| Operation                    | Method | Endpoint                                                                    |
| ---------------------------- | ------ | --------------------------------------------------------------------------- |
| **Create an entity**         | `POST` | `/{plural-parent-entity-name}/{parentEntityId}/{plural-entity-name}`        |
| **Delete from a list**       | `POST` | `/{plural-parent-entity-name}/{parentEntityId}/{plural-entity-name}/delete` |
| **Append to a list**         | `POST` | `/{plural-parent-entity-name}/{parentEntityId}/{plural-entity-name}/append` |
| **Get all entities**         | `GET`  | `/{plural-parent-entity-name}/{parentEntityId}/{plural-entity-name}`        |
| **Get a specific entity**    | `GET`  | `/{plural-entity-name}/{entityId}`                                          |
| **Update a specific entity** | `PUT`  | `/{plural-entity-name}/{entityId}`                                          |

<Info>
  * "Create" operations using the `POST` method expect every **Required (R)** field; omitting **Optional (O)** fields will set those fields to **Default** values.\* "Update" operations using the `PUT` method expect every **Write (W)** field; omitting these fields is equivalent to setting them to `null`, if possible.
</Info>

***

# Asynchronous Endpoints

"Catalogs" and "Reports" are requested and retrieved through asynchronous endpoints. Those will send a response once the request is done processing (not in real-time).

| Operation                                         | Method | Endpoint                                                                                                                    |
| ------------------------------------------------- | ------ | --------------------------------------------------------------------------------------------------------------------------- |
| **Create a resource request**                     | `POST` | `/{plural-parent-entity-name}/{parentEntityId}/{plural-entity-name}` or `/{plural-parent-entity-name}/{plural-entity-name}` |
| **Retrieve the status of the requested resource** | `GET`  | `/{plural-entity-name}/{entityId}/status`                                                                                   |
| **Retrieve the output of the requested resource** | `GET`  | `/{plural-entity-name}/{entityId}/output`                                                                                   |

***

# Bulk calls

<Info>
  Please refer to[ this page](/retail-media/docs/bulk-calls) for more information about Bulk Calls.
</Info>

***

# Error Codes

When sending more than 50 IDs, you will get the following `400 Bad request` HTTP Response:

<CodeGroup>
  ```json JSON theme={null}
  {
      "errors": [
          {
              "code": "exceeded-ids-cap",
              "title": "Requests are capped for 50 unique ids, 51 were provided",
              "type": "validation",
              "traceId": "aa47dd83-8ca9-4a79-a179-ad5be6932ff1",
              "instance": "/api/v1/reports/line-item",
              "detail": "ids Requests are capped for 50 unique ids, 51 were provided (Value: \"1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51\")",
              "source": {
                  "ids": "data/attributes/ids"
              }
          }
      ]
  }
  ```
</CodeGroup>

This Contains:

* Error code: `exceeded-ids-cap`

* Error title: `Requests are capped for 50 unique ids, {count of ids requested} were provided`

* Error Type: `validation`

* A traceId: `aa47dd83-8ca9-4a79-a179-ad5be6932ff1`

* Instance: the report requested (here `/api/v1/reports/line-item`)

* Detail: Title with a list of requested IDs

* Source: The parameter that caused the error (IDs in this case)

***

**What’s Next**

* [Bulk Calls](/retail-media/v2025.01/docs/bulk-calls)
* [Campaign Structure](/retail-media/v2025.01/docs/campaign-structure)
* [List of Endpoints](/retail-media/v2025.01/docs/criteo-api-swagger)
* [Rate Limits](/retail-media/v2025.01/docs/rate-limits)
* [Statuses](/retail-media/v2025.01/docs/campaign-lineitem-status)