# Reverse a Transaction
source: https://developer.mastercard.com/mastercard-processing-core/documentation/sandbox-testing/transactions-and-fees-management/reverse-a-trans/index.md

## Test case -- Success {#test-case--success}

This test case describes reversing a specified transaction.

**Sample request**

`POST /transactions/90001/reversal`

```JSON
{
  "reason" : "REVERSAL"
}
```

**Sample response**

`201`  

`Location: /transaction-documents?transaction_selector_type=ID&transaction_selector_value=2829673`

```JSON
{
  "transactionId": 2829673
}
```

## Test case -- Fail -- No serviceClassCode linked to the Transaction {#test-case--fail--no-serviceclasscode-linked-to-the-transaction}

This test case describes an attempt to reverse a specified transaction for which the CMS does not store the `serviceClassCode` value.

For this test case, use the following information in the request:

|  Path parameter  | Available value |
|------------------|-----------------|
| `transaction_id` | 99210           |

**Sample request**

`POST /transactions/99210/reversal`

```JSON
{
  "reason": "REVERSAL"
}
```

**Sample response**

`400`

```JSON
{
  "Errors": {
    "Error": [
      {
        "Source": "MASTERCARD PROCESSING",
        "ReasonCode": "REVERSE_DOC_FLOW_INTERRUPT",
        "Description": "ServiceClass is missing in the CMS for transaction with id 99210",
        "Recoverable": false
      }
    ]
  }
}
```

## Test case -- Fail -- No transactionType linked to the Transaction {#test-case--fail--no-transactiontype-linked-to-the-transaction}

This test case describes an attempt to reverse a specified transaction for which the CMS does not store the `transactionType` value.

For this test case, use the following information in the request:

|  Path parameter  | Available value |
|------------------|-----------------|
| `transaction_id` | 99110           |

**Sample request**

`POST /transactions/99110/reversal`

```JSON
{
  "reason": "REVERSAL"
}
```

**Sample response**

`400`

```JSON
{
  "Errors": {
    "Error": [
      {
        "Source": "MASTERCARD PROCESSING",
        "ReasonCode": "REVERSE_DOC_FLOW_INTERRUPT",
        "Description": "TransactionType is missing in the CMS for the transaction with id 99110.",
        "Recoverable": false
      }
    ]
  }
}
```

## Test case -- Fail -- Reverse not allowed for the given serviceClassCode {#test-case--fail--reverse-not-allowed-for-the-given-serviceclasscode}

This test case describes an attempt to reverse a specified transaction for which the `serviceClassCode` value is not allowed to be reversed by the CMS.

For this test case, use the following information in the request:

|  Path parameter  | Available value |
|------------------|-----------------|
| `transaction_id` | 99410           |

**Sample request**

`POST /transactions/99410/reversal`

```JSON
{
  "reason": "REVERSAL"
}
```

**Sample response**

`400`

```JSON
{
  "Errors": {
    "Error": [
      {
        "Source": "MASTERCARD PROCESSING",
        "ReasonCode": "REVERSE_DOC_FLOW_INTERRUPT",
        "Description": "ServiceClassCode for a transaction with id 99410 is not on the list of parameters permitted to reverse a transaction.",
        "Recoverable": false
      }
    ]
  }
}
```

## Test case -- Fail -- Reverse not allowed for the given transactionType {#test-case--fail--reverse-not-allowed-for-the-given-transactiontype}

This test case describes an attempt to reverse a specified transaction which the `transactionType` value is not allowed to be reversed by the CMS.

For this test case, use the following information in the request:

|  Path parameter  | Available value |
|------------------|-----------------|
| `transaction_id` | 99310           |

**Sample request**

`POST /transactions/99310/reversal`

```JSON
{
  "reason": "REVERSAL"
}
```

**Sample response**

`400`

```JSON
{
  "Errors": {
    "Error": [
      {
        "Source": "MASTERCARD PROCESSING",
        "ReasonCode": "REVERSE_DOC_FLOW_INTERRUPT",
        "Description": "TransactionType for a transaction with id 99310 is not on the list of parameters permitted to reverse the transaction.",
        "Recoverable": false
      }
    ]
  }
}
```

## Test case -- Fail -- Incorrect Transaction status {#test-case--fail--incorrect-transaction-status}

This test case describes an attempt to reverse a specified transaction which the `postingStatus` value in the CMS is other than `Posted`.

For this test case, use the following information in the request:

|  Path parameter  | Available value |
|------------------|-----------------|
| `transaction_id` | 99510           |

**Sample request**

`POST /transactions/99510/reversal`

```JSON
{
  "reason": "REVERSAL"
}
```

**Sample response**

`400`

```JSON
{
  "Errors": {
    "Error": [
      {
        "Source": "MASTERCARD PROCESSING",
        "ReasonCode": "UNEXPECTED_DOCUMENT_STATUS",
        "Description": "Transaction with id 99510 not in the postingStatus permitted to be reversed.",
        "Recoverable": false
      }
    ]
  }
}
```