Void a transaction

POST

/v1/transactions/{systemTransactionId}/modifications

Request example

Use the following request to void a captured transaction.

{
  "merchant": "MERCHANT-1",
  "site": "SITE-1",
  "merchantTransactionId": "TRANSACTION-2",
  "merchantTransactionDate": "2025-01-27T08:51:02.826Z",
  "amounts": {
    "transaction": 24.99
  },
  "operation": "Void"
}

Parameter	Description
`merchant` string (≤ 20 characters) required	Your unique merchant identifier, as assigned by PXP.
`site` string (≤ 20 characters) required	Your unique site identifier, as assigned by PXP.
`merchantTransactionId` string (≤ 50 characters) required	The unique identifier for this transaction, as chosen by you.
`merchantTransactionDate` date-time required	The date and time when the initial transaction happened, in ISO 8601 format.
`amounts` object required	Details about the transaction amount.
`amounts.transaction` string required	The value of the transaction. For `Void` operations, this should match the original transaction value.
`operation` string required	The type of modification that you want to make. Set this to `Void`. Possible values: `Capture` `Refund` `Incremental` `Void`

Response example

If your request is successful, you'll receive a 200 request containing a new systemTransactionId and an updated state. You'll also receive a Transaction (Card Cancelled) webhook notification.

{
  "state": "Cancelled",
  "stateData": {},
  "approvalCode": "515378",
  "merchantTransactionDate": "2025-03-27T10:38:43.708Z",
  "merchantTransactionId": "430e6a5d-eb60-48c3-97a8-d6ee15644543",
  "systemTransactionId": "b58c50c5-e86b-4376-af81-ad36a245a2af",
  "fundingData": {
    "cardScheme": "MasterCard",
    "primaryAccountNumber": "526600******0075",
    "expiryMonth": "12",
    "expiryYear": "2031",
    "gatewayTokenId": "5fbd77ce-02c1-40ed-94bc-1016660b7512",
    "providerResponse": {
      "provider": "pxpfinancial",
      "code": "00",
      "electronicCommerceIndicatorAdjustment": "07",
      "merchantAdvice": {},
      "authorisedAmount": 0
    },
    "processorTransactionId": "33f6bdb3-b39b-46f3-a4b0-eb00afc69e48"
  }
}