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

# Adjust

Adjust increases the reserved amount of a pre-authorisation. Use it when the final order amount grows after the initial pre-auth — for example, when a customer adds items or extends a rental period.

<Tip>You can only adjust an uncaptured pre-authorisation.</Tip>

## API request

```bash theme={null}
curl --request POST \
  --url https://gateway.paybyrd.com/api/v2/adjust/{transactionId} \
  --header 'Accept: application/json' \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: {your_api_key}' \
  --data '{"amount": "5.00"}'
```

| Parameter       | Location     | Description                                            |
| --------------- | ------------ | ------------------------------------------------------ |
| `transactionId` | URL path     | ID of the pre-authorised transaction to adjust         |
| `amount`        | Request body | The **additional** amount to add to the reserved total |

## Response

```json theme={null}
{
  "code": "BYRD200",
  "description": "Operation successfully completed",
  "transactionId": "c16ce479-319d-4e7b-a966-7735c34b2cc5",
  "amount": "15.00",
  "previousAmount": "10.00"
}
```

| Field            | Description                                        |
| ---------------- | -------------------------------------------------- |
| `code`           | `BYRD200` = success                                |
| `transactionId`  | ID of the adjusted transaction                     |
| `amount`         | Updated total reserved amount after the adjustment |
| `previousAmount` | Reserved amount before the adjustment              |