(DataFlex) Paynow.pl -- Make a Payment Request

Make a payment request POST with prepared message on Paynow payment request endpoint.

For more information, see https://docs.paynow.pl/#section/Payments/Make-a-payment

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-win32.pkg

Procedure Test
    Handle hoHttp
    Boolean iSuccess
    Variant vJson
    Handle hoJson
    String sMyApiAccessKey
    String sMySigCalcKey
    Handle hoCrypt
    String sMessageBody
    String sSignature
    Variant vResp
    Handle hoResp
    Handle hoJsonResp
    String sRedirectUrl
    String sPaymentId
    String sStatus
    String sTemp1
    Boolean bTemp1

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    Get Create (RefClass(cComChilkatHttp)) To hoHttp
    If (Not(IsComObjectCreated(hoHttp))) Begin
        Send CreateComObject of hoHttp
    End

    // Implements the following CURL command:

    // curl --request POST 'https://api.sandbox.paynow.pl/v1/payments' \
    // -H 'Content-Type: application/json' \
    // -H 'Api-Key: c12c386b-650b-43db-9430-d84fc05d9433' \
    // -H 'Signature: aYPCytCoc+/wFgqHZJjgBCi20omXTn0yzm9LysJgnFo=' \
    // -H 'Idempotency-Key: 59c6dd26-f905-487b-96c9-fd1d2bd76885' \
    // --data-raw '{
    //     "amount": 45671,
    //     "externalId": "234567898654",
    //     "description": "Test transaction",
    //     "buyer": {
    //         "email": "jan.kowalski@melements.pl"
    //     }
    // }'

    // Use the following online tool to generate HTTP code from a CURL command
    // Convert a cURL Command to HTTP Source Code

    // Use this online tool to generate code from sample JSON:
    // Generate Code to Create JSON

    // The following JSON is sent in the request body.

    // {
    //   "amount": 45671,
    //   "externalId": "234567898654",
    //   "description": "Test transaction",
    //   "buyer": {
    //     "email": "jan.kowalski@melements.pl"
    //   }
    // }

    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End
    Get ComUpdateInt Of hoJson "amount" 45671 To iSuccess
    Get ComUpdateString Of hoJson "externalId" "234567898654" To iSuccess
    Get ComUpdateString Of hoJson "description" "Test transaction" To iSuccess
    Get ComUpdateString Of hoJson "buyer.email" "jan.kowalski@melements.pl" To iSuccess

    Move "c12c386b-650b-43db-9430-d84fc05d9433" To sMyApiAccessKey
    Move "b758f20d-ba92-44fa-acca-f57e99787b9d" To sMySigCalcKey

    // Calculate the Signature header.
    Get Create (RefClass(cComChilkatCrypt2)) To hoCrypt
    If (Not(IsComObjectCreated(hoCrypt))) Begin
        Send CreateComObject of hoCrypt
    End
    Set ComMacAlgorithm Of hoCrypt To "hmac"
    Set ComEncodingMode Of hoCrypt To "base64"
    Get ComSetMacKeyString Of hoCrypt sMySigCalcKey To iSuccess
    Set ComHashAlgorithm Of hoCrypt To "SHA-256"
    Get ComEmit Of hoJson To sMessageBody
    Get ComMacStringENC Of hoCrypt sMessageBody To sSignature

    Get ComGenerateUuid Of hoCrypt To sTemp1
    Send ComSetRequestHeader To hoHttp "Idempotency-Key" sTemp1
    Send ComSetRequestHeader To hoHttp "Api-Key" sMyApiAccessKey
    Send ComSetRequestHeader To hoHttp "Signature" sSignature
    Send ComSetRequestHeader To hoHttp "Content-Type" "application/json"
    Set ComAccept Of hoHttp To "application/json"

    Get pvComObject of hoJson to vJson
    Get ComPostJson3 Of hoHttp "https://api.sandbox.paynow.pl/v1/payments" "application/json" vJson To vResp
    If (IsComObject(vResp)) Begin
        Get Create (RefClass(cComChilkatHttpResponse)) To hoResp
        Set pvComObject Of hoResp To vResp
    End
    Get ComLastMethodSuccess Of hoHttp To bTemp1
    If (bTemp1 = False) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Showln "Response body:"
    Get ComBodyStr Of hoResp To sTemp1
    Showln sTemp1

    // Sample response:
    // {
    //   "redirectUrl": "https://paywall.sandbox.paynow.pl/NOA0-YJ9-Y1P-29V?token=eyJraWQiOiJhMD ... L60wk",
    //   "paymentId": "NOA0-YJ9-Y1P-29V",
    //   "status": "NEW"
    // }

    Get Create (RefClass(cComChilkatJsonObject)) To hoJsonResp
    If (Not(IsComObjectCreated(hoJsonResp))) Begin
        Send CreateComObject of hoJsonResp
    End
    Get ComBodyStr Of hoResp To sTemp1
    Get ComLoad Of hoJsonResp sTemp1 To iSuccess
    Get ComStringOf Of hoJson "redirectUrl" To sRedirectUrl
    Get ComStringOf Of hoJson "paymentId" To sPaymentId
    Get ComStringOf Of hoJson "status" To sStatus


End_Procedure