(Objective-C) PayPal - Cancel Sent Invoice

Cancels a sent invoice, by ID, and, optionally, sends a notification about the cancellation to the payer, merchant, and Cc: emails.

Note: This example requires Chilkat v9.5.0.65 or greater.

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#import <CkoJsonObject.h>
#import <CkoStringBuilder.h>
#import <CkoRest.h>

// Note: Requires Chilkat v9.5.0.65 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)
CkoJsonObject *jsonToken = [[CkoJsonObject alloc] init];
[jsonToken LoadFile: @"qa_data/tokens/paypal.json"];

// Build the Authorization request header field value.
CkoStringBuilder *sbAuth = [[CkoStringBuilder alloc] init];
// token_type should be "Bearer"
[sbAuth Append: [jsonToken StringOf: @"token_type"]];
[sbAuth Append: @" "];
[sbAuth Append: [jsonToken StringOf: @"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.
CkoRest *rest = [[CkoRest alloc] init];
BOOL bAutoReconnect = YES;
BOOL success = [rest Connect: @"api.sandbox.paypal.com" port: [NSNumber numberWithInt: 443] tls: YES autoReconnect: bAutoReconnect];
if (success != YES) {
    NSLog(@"%@",rest.LastErrorText);
    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 the JSON request body containing the reminder information:
CkoJsonObject *json = [[CkoJsonObject alloc] init];
json.EmitCompact = NO;
[json UpdateString: @"subject" value: @"Past due"];
[json UpdateString: @"note" value: @"Canceling invoice"];
[json UpdateBool: @"send_to_merchant" value: YES];
[json UpdateBool: @"send_to_payer" value: YES];
NSLog(@"%@",[json Emit]);

// The JSON created by the above code:

// 	{ 
// 	  "subject": "Past due",
// 	  "note": "Canceling invoice",
// 	  "send_to_merchant": true,
// 	  "send_to_payer": true
// 	}

// Build a path using a previously-sent invoice ID.
CkoStringBuilder *sbPath = [[CkoStringBuilder alloc] init];
[sbPath Append: @"/v1/invoicing/invoices/invoice_id/cancel"];
int numReplacements = [[sbPath Replace: @"invoice_id" replacement: @"INV2-XPWZ-NUTQ-LNWB-P8NC"] intValue];

json.EmitCompact = YES;
CkoStringBuilder *sbRequestBody = [[CkoStringBuilder alloc] init];
CkoStringBuilder *sbResponseBody = [[CkoStringBuilder alloc] init];

[rest AddHeader: @"Content-Type" value: @"application/json"];
[rest AddHeader: @"Authorization" value: [sbAuth GetAsString]];
[json EmitSb: sbRequestBody];

success = [rest FullRequestSb: @"POST" uriPath: [sbPath GetAsString] requestBody: sbRequestBody responseBody: sbResponseBody];
if (success != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

NSLog(@"%@%d",@"Response Status Code = ",[rest.ResponseStatusCode intValue]);

// In our testing, we received a 204 response, which is a success HTTP response code, but 
// differs from the PayPal REST API reference documentation, which states that a 202 response
// is expected.  I suspect an error in the PayPal documentation, or in the PayPal responder.
// Check for either 202 or 204..
// Did we get a 202 accepted response?
if (([rest.ResponseStatusCode intValue] != 202) && ([rest.ResponseStatusCode intValue] != 204)) {
    NSLog(@"%@",[sbResponseBody GetAsString]);
    NSLog(@"%@",@"Failed.");
    return;
}

// The 202/204 response should be empty.  (Again, our experience differs from the online PayPal documentation..)
NSLog(@"%@",@"Success.");