8.2 Voucher Management APIs

The first API in the section below is used to request for a voucher with a specific value, currency, and purpose. The server responds with a voucher number, serial number, and expiry date. The second call activates the pre-activated voucher. The third call processes voucher redemption, crediting the merchant if valid. The fourth APIs allow for voucher status checks.

8.2.1 VoucherPreActivation

a) VoucherPreActivation()

The VoucherPreActivation API is used by non-Payment Building Blocks in the GovStack Framework to request for a voucher to be used. This call reserves the voucher (for a period, which is to be implemented). This API requests a single voucher from the voucher server that can be used for a future redemption process. The caller sends an amount, a voucher group (depending on the use case), the currency, and the name of the calling GovStack Building Block. If the API call is successful, the Payment Building Block will respond with a voucher number, a voucher serial number, and an expiry date.

Create vouchers in the Voucher Engine.

post

Header parameters

X-Program-Idstring · max: 20Optional

In case a Government Entity has specific budget account for a Program.

X-Registering-Institution-Idstring · max: 20Optional

ID of the Issuing Agency, used for validation and data scoping.

X-Callback-URLstring · max: 100Required

URL on which the result is published.

Body

application/json

requestIDstring · max: 12Optional

Globally unique ID.

batchIDstring · max: 12Optional

BatchID for batch.

Responses

200

Response from the Voucher Engine.

application/json

post

/vouchers

HTTPcURLJavaScriptPython

POST /vouchers HTTP/1.1
X-Callback-URL: text
Content-Type: application/json
Accept: */*
Content-Length: 183

{
  "requestID": "text",
  "batchID": "text",
  "voucherInstructions": [
    {
      "instructionID": "text",
      "groupCode": "text",
      "currency": "text",
      "amount": null,
      "payeeFunctionalID": "text",
      "narration": "text"
    }
  ]
}

200

Response from the Voucher Engine.

{
  "ResponseCode": "text",
  "ResponseDescription": "text",
  "RequestID": "text"
}

b) Create_Vouchers_Response()

Description This is the API called by the Voucher Engine to return Voucher Details once vouchers have been created in the Voucher Engine.

Return created vouchers' details from Voucher Engine.

post

Body

application/json

requestIDstring · max: 12Optional

Globally unique ID.

batchIDstring · max: 12Optional

BatchID for batch.

Responses

200

Voucher details successfully received by Source BB.

No content

202

Voucher details acceptance is acknowledged and will be processed by Source BB.

post

/voucher-details-return

HTTPcURLJavaScriptPython

POST /voucher-details-return HTTP/1.1
Content-Type: application/json
Accept: */*
Content-Length: 182

{
  "requestID": "text",
  "batchID": "text",
  "voucherInstructions": [
    {
      "instructionID": "text",
      "serialNumber": "text",
      "voucherNumber": "text",
      "currency": "text",
      "amount": null,
      "narration": "text"
    }
  ]
}

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8.2.2 VoucherActivation

a) Voucher_Activation()

The VoucherActivation API is used by non-Payments Building Blocks in the GovStack Framework to activate a pre-activated voucher. This second function call is intended to ensure that the voucher is only activated when it is disbursed. This API requests for the activation of a voucher when the caller sends the voucher number to be activated. If the API call is successful, the activation is confirmed, and the voucher can now be used by the beneficiary.

Update the status of vouchers.

put

Query parameters

commandstringRequired

For this use case, the value of the command is activate.

Body

application/json

RequestIDstring · max: 12Optional

Globally unique ID.

BatchIDstring · max: 12Optional

BatchID for batch.

Responses

200

Voucher status successfully updated by Voucher Engine.

application/json

put

/vouchers

HTTPcURLJavaScriptPython

PUT /vouchers?command=text HTTP/1.1
Content-Type: application/json
Accept: */*
Content-Length: 85

{
  "RequestID": "text",
  "BatchID": "text",
  "VoucherInstructions": [
    {
      "serialNumber": "text"
    }
  ]
}

200

Voucher status successfully updated by Voucher Engine.

{
  "ResponseCode": "text",
  "ResponseDescription": "text",
  "RequestID": "text"
}

For Batch voucher activation, the voucher activation APIS is used by calling Building Block to activate vouchers in bulk. This may be used for bulk social cash transfers where the recipients receive benefits by vouchers. The calling Building Block is responsible for generating the beneficiary file as well as dispensing the vouchers. The Payments Building Block is responsible for generating and redeeming the voucher codes. Both BBs will have had to have exchanged encryption keys during the implementation phase.

The file provided by the calling Building Block will typically contain a unique identifier, the amount of the voucher required, the currency of the voucher, and the voucher group. While the file format may vary, the recommended file format is an encrypted JSON file.

If the file is properly formatted, the Payments Building Block will respond with a file that contains the unique ID that was sent, the status, the voucher number, the voucher serial number, and the expiry date of the voucher. The response file will also be an encrypted file to ensure the appropriate security of the voucher number.

The calling building block will dispense the vouchers as needed using an appropriate delivery mechanism. The calling Building Block will also be responsible for any verification of the beneficiary during the redemption process. The description of the dispensing of the vouchers once the calling block has received it is outside the scope of the Payments Building Block.

b) Voucher_Activate_Response()

Description This is the response API called by the Voucher Engine to confirm the status of batch activation back to the calling BB.

Confirm the status of batch activation.

post

Body

application/json

requestIDstring · max: 12Optional

Globally unique ID.

registerRequestIDstring · max: 12Optional

Echo the ID of the original Voucher_Activate API call.

numberFailedCasesintegerOptional

Number of failed activation cases.

Responses

200

Activation confirmation successfully received by Source BB.

application/json

202

Activation confirmation acknowledged and is under process by Source BB.

post

/callback-url

HTTPcURLJavaScriptPython

POST /callback-url HTTP/1.1
Content-Type: application/json
Accept: */*
Content-Length: 132

{
  "requestID": "text",
  "registerRequestID": "text",
  "numberFailedCases": 1,
  "failedCases": [
    {
      "serialNumber": "text",
      "failureReason": "text"
    }
  ]
}

{
  "status": "success"
}

8.2.3 VoucherRedemption

The VoucherRedemption API is used by non-Payment Building Blocks in the GovStack Framework to redeem a voucher. The calling Building Block will capture the voucher number and the voucher serial number from the merchant point. The external Building Block will also acquire the merchant name and payment details from the merchant registry. The calling Building Block will then send the voucher number, the voucher serial number, the merchant’s name, and payment details. The Payment Building Block will verify that the voucher has been activated and has not been used or blocked or canceled. If so, the Payment Building Block will then send a payment request to the funding agency/Financial Services Provider. The Payment Gateway of the Payments Building Block will facilitate the debit of the funding account, and the credit of the merchant as well as handle any intermediary fees. Once the payment has been successfully done the Payment Building Block will mark the voucher as consumed and notify the merchant (and beneficiary if possible).

Redeem a voucher.

post

Authorizations

bearerAuth

AuthorizationstringRequired

Bearer authentication header of the form Bearer <token>.

Query parameters

commandstring · enumRequired

Command for the action.

Possible values:

Body

application/json

requestIDstring · max: 12Optional

Globally unique ID.

voucherSerialNumberstringOptional

Voucher Serial Number.

agentIDstring · max: 10Optional

Agent or Merchant ID.

voucherSecretNumberstring · max: 6Optional

Voucher secret number for redemption.

Responses

200

Voucher redemption details.

application/json

post

/vouchers

HTTPcURLJavaScriptPython

POST /vouchers?command=cancel HTTP/1.1
Authorization: Bearer YOUR_SECRET_TOKEN
Content-Type: application/json
Accept: */*
Content-Length: 95

{
  "requestID": "text",
  "voucherSerialNumber": "text",
  "agentID": "text",
  "voucherSecretNumber": "text"
}

200

Voucher redemption details.

{
  "status": 1,
  "message": "text",
  "serialNumber": "text",
  "value": 1,
  "timestamp": "2026-02-03T06:43:22.556Z",
  "transactionId": "text"
}

8.2.4 VoucherStatus

The VoucherStatus API is used by non-Payment Building Blocks in the GovStack Framework to check the status of a voucher. The calling Building Block will capture the voucher number and send it to the Payments Building Block to determine the status of a voucher. The Payments Building Block will respond with one of the statuses of Pre-Activated, Activated, Suspended, Blocked, or Not Existing.

Retrieve voucher status.

get

Authorizations

bearerAuth

AuthorizationstringRequired

Bearer authentication header of the form Bearer <token>.

Path parameters

serialNumberstring · max: 20Required

Unique Reference Number assigned to the voucher.

Query parameters

fieldsstring · enumRequired

Query parameter to retrieve status.

Possible values:

Responses

200

Voucher status details.

application/json

400

Bad request (invalid voucher serial number).

application/json

get

/vouchers/{serialNumber}

HTTPcURLJavaScriptPython

GET /vouchers/{serialNumber}?fields=status HTTP/1.1
Authorization: Bearer YOUR_SECRET_TOKEN
Accept: */*

{
  "status": 1,
  "serialNumber": "text",
  "value": 1
}

8.2.5 VoucherCancellation

Voucher_Cancellation()

Description This API will be called by the Source-BB to update the status of the voucher(s), in the case of cancellation, the status code 03 is sent to the relevant field of the instruction array.

The VoucherCancellation API is used by non-Payments Building Blocks in the GovStack Framework to cancel a voucher. The calling Building Block will capture the voucher number and send it to the Payments Building Block to cancel the voucher.

Cancel a voucher.

post

Authorizations

bearerAuth

AuthorizationstringRequired

Bearer authentication header of the form Bearer <token>.

Query parameters

commandstring · enumRequired

Operation command.

Possible values:

Body

application/json

requestIDstring · max: 12Optional

Globally unique ID.

batchIDstring · max: 12Optional

Batch ID for the batch.

Responses

200

Voucher cancellation processed.

application/json

post

/vouchers

HTTPcURLJavaScriptPython

POST /vouchers?command=cancel HTTP/1.1
Authorization: Bearer YOUR_SECRET_TOKEN
Content-Type: application/json
Accept: */*
Content-Length: 85

{
  "requestID": "text",
  "batchID": "text",
  "voucherInstructions": [
    {
      "serialNumber": "text"
    }
  ]
}

200

Voucher cancellation processed.

{
  "responseCode": "text",
  "responseDescription": "text",
  "requestID": "text"
}

---

Voucher_ Cancellation_Response()

Description Response API called by the Voucher Engine to confirm the cancellation of the voucher. The Payments Building Block will respond with a status of Cancelled, Already Cancelled, or Not Existing. The Voucher Cancellation will override the Blocked status and render the voucher permanently unusable.

Confirm voucher cancellation.

post

Authorizations

bearerAuth

AuthorizationstringRequired

Bearer authentication header of the form Bearer <token>.

Body

application/json

requestIDstring · max: 12Optional

Globally unique ID.

registerRequestIDstring · max: 12Optional

Echo the ID of the original Voucher_Cancellation API call.

numberFailedCasesintegerOptional

The number of cases failed.

Responses

200

Voucher cancellation confirmation processed successfully.

No content

202

Voucher cancellation confirmation received and is being processed.

post

/vouchers/cancellation/confirmation

HTTPcURLJavaScriptPython

POST /vouchers/cancellation/confirmation HTTP/1.1
Authorization: Bearer YOUR_SECRET_TOKEN
Content-Type: application/json
Accept: */*
Content-Length: 132

{
  "requestID": "text",
  "registerRequestID": "text",
  "numberFailedCases": 1,
  "failedCases": [
    {
      "serialNumber": "text",
      "failureReason": "text"
    }
  ]
}

No content