(Delphi DLL) PayPal Search for Invoices

Search PayPal invoices.

See also SearchInvoices

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, StringBuilder, Rest, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
jsonToken: HCkJsonObject;
sbAuth: HCkStringBuilder;
rest: HCkRest;
bAutoReconnect: Boolean;
success: Boolean;
json: HCkJsonObject;
sbRequestBody: HCkStringBuilder;
sbResponseBody: HCkStringBuilder;
jsonResponse: HCkJsonObject;
numInvoices: Integer;
i: Integer;
j: Integer;
numBillingInfo: Integer;
numLinks: Integer;

begin
// 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) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

// ----------------------------------------------------------------------------------------------
// 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..
// ----------------------------------------------------------------------------------------------

// Create JSON to specify the search
json := CkJsonObject_Create();
CkJsonObject_putEmitCompact(json,False);
CkJsonObject_AppendString(json,'start_invoice_date','2016-01-01 PST');
CkJsonObject_AppendString(json,'end_invoice_date','2016-11-16 PST');
CkJsonObject_AppendInt(json,'page',0);
CkJsonObject_AppendInt(json,'page_size',10);
CkJsonObject_AppendBool(json,'total_count_required',True);

Memo1.Lines.Add(CkJsonObject__emit(json));

// The JSON by the above code:

// 	{
// 	  "start_invoice_date": "2016-01-01 PST",
// 	  "end_invoice_date": "2016-11-16 PST",
// 	  "page": 0,
// 	  "page_size": 10,
// 	  "total_count_required": true
// 	}

// Send the POST equivalent to this CURL command:

// 	curl -v -X POST https://api.sandbox.paypal.com/v1/invoicing/search/ \
// 	-H "Content-Type:application/json" \
// 	-H "Authorization: Bearer Access-Token" \
// 	-d '{ invoice JSON goes here }'

CkJsonObject_putEmitCompact(json,True);
sbRequestBody := CkStringBuilder_Create();
sbResponseBody := CkStringBuilder_Create();

CkRest_AddHeader(rest,'Content-Type','application/json');
CkRest_AddHeader(rest,'Authorization',CkStringBuilder__getAsString(sbAuth));
CkJsonObject_EmitSb(json,sbRequestBody);

success := CkRest_FullRequestSb(rest,'POST','/v1/invoicing/search',sbRequestBody,sbResponseBody);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

// We should have some sort of JSON response.  It could be successful, or an error.
jsonResponse := CkJsonObject_Create();
CkJsonObject_putEmitCompact(jsonResponse,False);
CkJsonObject_LoadSb(jsonResponse,sbResponseBody);

Memo1.Lines.Add('Response Status Code = ' + IntToStr(CkRest_getResponseStatusCode(rest)));

// Did we get a 200 success response?
if (CkRest_getResponseStatusCode(rest) <> 200) then
  begin
    // Show the JSON response body
    Memo1.Lines.Add(CkJsonObject__emit(jsonResponse));
    Memo1.Lines.Add('Failed.');
    Exit;
  end;

// Sample response JSON is shown below.

// Iterate over each invoice and get some information from each..
numInvoices := CkJsonObject_SizeOfArray(jsonResponse,'invoices');
i := 0;
while i < numInvoices do
  begin
    CkJsonObject_putI(jsonResponse,i);
    Memo1.Lines.Add('Invoice ID: ' + CkJsonObject__stringOf(jsonResponse,'invoices[i].id'));
    Memo1.Lines.Add('Shipping First Name: ' + CkJsonObject__stringOf(jsonResponse,'invoices[i].shipping_info.first_name'));
    j := 0;
    numBillingInfo := CkJsonObject_SizeOfArray(jsonResponse,'invoices[i].billing_info');
    while j < numBillingInfo do
      begin
        CkJsonObject_putJ(jsonResponse,j);
        Memo1.Lines.Add('billing_info email: ' + CkJsonObject__stringOf(jsonResponse,'invoices[i].billing_info[j].email'));
        j := j + 1;
      end;

    numLinks := CkJsonObject_SizeOfArray(jsonResponse,'invoices[i].links');
    j := 0;
    while j < numLinks do
      begin
        CkJsonObject_putJ(jsonResponse,j);
        Memo1.Lines.Add('link: ' + CkJsonObject__stringOf(jsonResponse,'invoices[i].links[j].href'));
        j := j + 1;
      end;

    Memo1.Lines.Add('----');
    i := i + 1;
  end;

Memo1.Lines.Add('Success.');

// A successful response looks like this:

// { 
//   "total_count": 2,
//   "invoices": [
//     { 
//       "id": "INV2-XV4B-736P-PLVN-SZCE",
//       "number": "0002",
//       "status": "DRAFT",
//       "merchant_info": { 
//         "email": "smith-facilitator@chilkatsoft.com"
//       },
//       "billing_info": [
//         { 
//           "email": "smith-buyer@chilkatsoft.com"
//         }
//       ],
//       "shipping_info": { 
//         "email": "smith-buyer@chilkatsoft.com",
//         "first_name": "Sally",
//         "last_name": "Patient",
//         "business_name": "Not applicable"
//       },
//       "invoice_date": "2016-11-15 PST",
//       "payment_term": { 
//         "due_date": "2016-12-30 PST"
//       },
//       "note": "Medical Invoice 16 Jul, 2013 PST",
//       "total_amount": { 
//         "currency": "USD",
//         "value": "500.00"
//       },
//       "metadata": { 
//         "created_date": "2016-11-15 08:09:21 PST"
//       },
//       "paid_amount": { 
//         "paypal": { 
//           "currency": "USD",
//           "value": "0.00"
//         },
//         "other": { 
//           "currency": "USD",
//           "value": "0.00"
//         }
//       },
//       "refunded_amount": { 
//         "paypal": { 
//           "currency": "USD",
//           "value": "0.00"
//         },
//         "other": { 
//           "currency": "USD",
//           "value": "0.00"
//         }
//       },
//       "links": [
//         { 
//           "rel": "self",
//           "href": "https://api.sandbox.paypal.com/v1/invoicing/invoices/INV2-XV4B-736P-PLVN-SZCE",
//           "method": "GET"
//         },
//         { 
//           "rel": "send",
//           "href": "https://api.sandbox.paypal.com/v1/invoicing/invoices/INV2-XV4B-736P-PLVN-SZCE/send",
//           "method": "POST"
//         },
//         { 
//           "rel": "update",
//           "href": "https://api.sandbox.paypal.com/v1/invoicing/invoices/INV2-XV4B-736P-PLVN-SZCE/update",
//           "method": "PUT"
//         },
//         { 
//           "rel": "delete",
//           "href": "https://api.sandbox.paypal.com/v1/invoicing/invoices/INV2-XV4B-736P-PLVN-SZCE",
//           "method": "DELETE"
//         }
//       ]
//     },
//     { 
//       "id": "INV2-ZG2H-HKAW-PMWU-N6ZR",
//       "number": "0001",
//       "status": "SENT",
//       "merchant_info": { 
//         "email": "smith-facilitator@chilkatsoft.com"
//       },
//       "billing_info": [
//         { 
//           "email": "smith-buyer@chilkatsoft.com"
//         }
//       ],
//       "shipping_info": { 
//         "email": "smith-buyer@chilkatsoft.com",
//         "first_name": "Sally",
//         "last_name": "Patient",
//         "business_name": "Not applicable"
//       },
//       "invoice_date": "2016-11-15 PST",
//       "payment_term": { 
//         "due_date": "2016-12-30 PST"
//       },
//       "note": "Medical Invoice 16 Jul, 2013 PST",
//       "total_amount": { 
//         "currency": "USD",
//         "value": "500.00"
//       },
//       "metadata": { 
//         "created_date": "2016-11-15 06:17:03 PST",
//         "payer_view_url": "https://www.sandbox.paypal.com/cgi_bin/webscr?cmd=_pay-inv&viewtype=altview&id=INV2-ZG2H-HKAW-PMWU-N6ZR"
//       },
//       "paid_amount": { 
//         "paypal": { 
//           "currency": "USD",
//           "value": "0.00"
//         },
//         "other": { 
//           "currency": "USD",
//           "value": "0.00"
//         }
//       },
//       "refunded_amount": { 
//         "paypal": { 
//           "currency": "USD",
//           "value": "0.00"
//         },
//         "other": { 
//           "currency": "USD",
//           "value": "0.00"
//         }
//       },
//       "links": [
//         { 
//           "rel": "self",
//           "href": "https://api.sandbox.paypal.com/v1/invoicing/invoices/INV2-ZG2H-HKAW-PMWU-N6ZR",
//           "method": "GET"
//         },
//         { 
//           "rel": "update",
//           "href": "https://api.sandbox.paypal.com/v1/invoicing/invoices/INV2-ZG2H-HKAW-PMWU-N6ZR/update",
//           "method": "PUT"
//         },
//         { 
//           "rel": "cancel",
//           "href": "https://api.sandbox.paypal.com/v1/invoicing/invoices/INV2-ZG2H-HKAW-PMWU-N6ZR/remind",
//           "method": "POST"
//         },
//         { 
//           "rel": "remind",
//           "href": "https://api.sandbox.paypal.com/v1/invoicing/invoices/INV2-ZG2H-HKAW-PMWU-N6ZR/cancel",
//           "method": "POST"
//         },
//         { 
//           "rel": "record-payment",
//           "href": "https://api.sandbox.paypal.com/v1/invoicing/invoices/INV2-ZG2H-HKAW-PMWU-N6ZR/record-payment",
//           "method": "POST"
//         },
//         { 
//           "rel": "qr-code",
//           "href": "https://api.sandbox.paypal.com/v1/invoicing/invoices/INV2-ZG2H-HKAW-PMWU-N6ZR/qr-code",
//           "method": "GET"
//         }
//       ]
//     }
//   ]
// }
// 

CkJsonObject_Dispose(jsonToken);
CkStringBuilder_Dispose(sbAuth);
CkRest_Dispose(rest);
CkJsonObject_Dispose(json);
CkStringBuilder_Dispose(sbRequestBody);
CkStringBuilder_Dispose(sbResponseBody);
CkJsonObject_Dispose(jsonResponse);

end;