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(C) PayPal Generate QR CodeGenerates a QR code for an invoice, by ID. The QR code is a PNG image in Base64-encoded format that corresponds to the invoice ID. Note: A QR code can only be generated for an invoice that has been both created and sent. See also Generate QR Code
#include <C_CkJsonObject.h> #include <C_CkStringBuilder.h> #include <C_CkRest.h> #include <C_CkBinData.h> void ChilkatSample(void) { HCkJsonObject jsonToken; HCkStringBuilder sbAuth; HCkRest rest; BOOL bAutoReconnect; BOOL success; HCkStringBuilder sbPath; int numReplacements; HCkStringBuilder sbJsonResponse; HCkJsonObject json; HCkBinData pngData; // Note: Requires Chilkat v9.5.0.64 or greater. // This requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // Load our previously obtained access token. (see PayPal OAuth2 Access Token) jsonToken = CkJsonObject_Create(); CkJsonObject_LoadFile(jsonToken,"qa_data/tokens/paypal.json"); // Build the Authorization request header field value. sbAuth = CkStringBuilder_Create(); // token_type should be "Bearer" CkStringBuilder_Append(sbAuth,CkJsonObject_stringOf(jsonToken,"token_type")); CkStringBuilder_Append(sbAuth," "); CkStringBuilder_Append(sbAuth,CkJsonObject_stringOf(jsonToken,"access_token")); // Make the initial connection. // A single REST object, once connected, can be used for many PayPal REST API calls. // The auto-reconnect indicates that if the already-established HTTPS connection is closed, // then it will be automatically re-established as needed. rest = CkRest_Create(); bAutoReconnect = TRUE; success = CkRest_Connect(rest,"api.sandbox.paypal.com",443,TRUE,bAutoReconnect); if (success != TRUE) { printf("%s\n",CkRest_lastErrorText(rest)); CkJsonObject_Dispose(jsonToken); CkStringBuilder_Dispose(sbAuth); CkRest_Dispose(rest); return; } // ---------------------------------------------------------------------------------------------- // The code above this comment could be placed inside a function/subroutine within the application // because the connection does not need to be made for every request. Once the connection is made // the app may send many requests.. // ---------------------------------------------------------------------------------------------- // Build a path using an invoice ID. sbPath = CkStringBuilder_Create(); CkStringBuilder_Append(sbPath,"/v1/invoicing/invoices/invoice_id/qr-code"); numReplacements = CkStringBuilder_Replace(sbPath,"invoice_id","INV2-ZG2H-HKAW-PMWU-N6ZR"); CkRest_AddHeader(rest,"Authorization",CkStringBuilder_getAsString(sbAuth)); // A 500x500 image results in a PNG file of approx. 4K bytes in size. CkRest_AddQueryParam(rest,"width","500"); CkRest_AddQueryParam(rest,"height","500"); CkRest_AddQueryParam(rest,"action","pay"); // Send the GET request and get the PNG image data as base64. // A successful JSON response looks like this: // {"image":"iVBORw0KGgoAA....AASUVORK5CYII="} sbJsonResponse = CkStringBuilder_Create(); success = CkRest_FullRequestNoBodySb(rest,"GET",CkStringBuilder_getAsString(sbPath),sbJsonResponse); if (success != TRUE) { printf("%s\n",CkRest_lastErrorText(rest)); CkJsonObject_Dispose(jsonToken); CkStringBuilder_Dispose(sbAuth); CkRest_Dispose(rest); CkStringBuilder_Dispose(sbPath); CkStringBuilder_Dispose(sbJsonResponse); return; } json = CkJsonObject_Create(); CkJsonObject_putEmitCompact(json,FALSE); CkJsonObject_LoadSb(json,sbJsonResponse); printf("Response Status Code = %d\n",CkRest_getResponseStatusCode(rest)); // Did we get a 200 success response? if (CkRest_getResponseStatusCode(rest) != 200) { printf("%s\n",CkJsonObject_emit(json)); printf("Failed.\n"); CkJsonObject_Dispose(jsonToken); CkStringBuilder_Dispose(sbAuth); CkRest_Dispose(rest); CkStringBuilder_Dispose(sbPath); CkStringBuilder_Dispose(sbJsonResponse); CkJsonObject_Dispose(json); return; } // If the 200 response is received, the response body contains the PNG data. // Save the PNG to a file. pngData = CkBinData_Create(); CkBinData_AppendEncoded(pngData,CkJsonObject_stringOf(json,"image"),"base64"); success = CkBinData_WriteFile(pngData,"qa_output/paypal_qr_code.png"); if (success == FALSE) { printf("Failed to save PNG file.\n"); CkJsonObject_Dispose(jsonToken); CkStringBuilder_Dispose(sbAuth); CkRest_Dispose(rest); CkStringBuilder_Dispose(sbPath); CkStringBuilder_Dispose(sbJsonResponse); CkJsonObject_Dispose(json); CkBinData_Dispose(pngData); return; } printf("Success.\n"); CkJsonObject_Dispose(jsonToken); CkStringBuilder_Dispose(sbAuth); CkRest_Dispose(rest); CkStringBuilder_Dispose(sbPath); CkStringBuilder_Dispose(sbJsonResponse); CkJsonObject_Dispose(json); CkBinData_Dispose(pngData); } |
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