Important information

The API reference is now available here.
The deprecated API reference is available here.


Manage Unzer Prepayment payments

Manage Unzer prepayment transactions

After the successful charge transaction, you can perform additional operations on the payment resource. Below you can see the most important cases for the Prepayment payment type.

For a full description of the charge transaction, refer to the relevant server-side integration documentation page: Charge a payment (direct API calls), Charge a payment (PHP SDK), Charge a payment (Java SDK).

Cancel before money receipt (reversal)

If the customer wants to cancel an order, before the money has been received, you have to make a cancel call on the initial Charge transaction.

$cancellation = $unzer->cancelChargeById(
Cancel cancel = unzer.cancelCharge(
The reversal will always be done on the initial transaction, thus the id will always be s-chg-1 or p-chg-1 respectively.

Cancel after payment (refund)

In case you received a payment for an order the customer wants to cancel, you can refund it up to the amount of the received payments. To do this you have to make a Cancel transaction on Charge(s) received via notification.

  "amount": 12.99,
  "paymentReference": "Test cancel transaction"
$cancellation = $unzer->cancelChargeById(
Cancel cancel = unzer.cancelCharge(

The response will look similar to the following example:

  "id": "s-cnl-1",
  "isSuccess": true,
  "isPending": false,
  "isError": false,
  "message": {
    "code": "COR.000.100.112",
    "merchant": "Request successfully processed in 'Merchant in Connector Test Mode'",
    "customer": "Your payments have been successfully processed in sandbox mode."
  "amount": "12.9900",
  "currency": "EUR",
  "date": "2021-06-09 10:09:47",
  "resources": {
    "customerId": "s-cst-a0b2dc42b4f9",
    "paymentId": "s-pay-2127",
    "basketId": "",
    "metadataId": "",
    "payPageId": "",
    "traceId": "a902d887e266e24c4a36d0f80ed0555f",
    "typeId": "s-ppy-eh15lfuhrfus"
  "orderId": "o191564001623233177",
  "paymentReference": "",
  "processing": {
    "uniqueId": "31HA07BC8159F6CC0D414B67FABD1444",
    "shortId": "4871.5978.7781",
    "traceId": "a902d887e266e24c4a36d0f80ed0555f"
The charges received after the initial charge are actual payments and can be refunded by canceling them.