## Retrieve Checkout

Retrieves a specific checkout by its ID for a given installation.

## Endpoint signature

```http
POST https://api.reservepay.com/sdk/retrieve-checkout HTTP/1.1
Content-Type: application/json
Accept: application/json

{
  merchant_id: string,
  installation_id: string,
  checkout_id: string,
}
```

Returns: object

## Request arguments

### `merchant_id` (string)

**Required**. Your merchant ID that uniquely identifies your account.

### `installation_id` (string)

**Required**. The installation ID for this platform.

### `checkout_id` (string)

**Required**. The ID of the checkout to retrieve.

## Response attributes

### `return_url` (string)

_Nullable_. The merchant's return URL the customer is sent back to when abandoning the checkout, or null if not set.

## Errors specific to this endpoint

### `NOT_FOUND`

The merchant, installation, or checkout could not be found with the provided IDs.

## Errors common to all endpoints

### `UNHANDLED_ERROR`

This error occurs when the server encounters an unexpected internal error that it cannot handle gracefully. This typically happens due to bugs, infrastructure issues, or edge cases that weren't anticipated during development.

### `INVALID_ARGUMENTS`

This error occurs when the request contains invalid or missing parameters. Common cases include missing required fields, or values that don't match the expected format or type.

### `BAD_VERSION`

This error occurs when making requests to an API version that is either deprecated or not yet released. This commonly happens when using an outdated SDK or when the API version specified in the request URL is incorrect.