(Objective-C) PayPal Send Invoice

Sends a PayPal invoice to a customer.

See also Send Invoice

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

// 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)
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 a path using a draft invoice ID.
CkoStringBuilder *sbPath = [[CkoStringBuilder alloc] init];
[sbPath Append: @"/v1/invoicing/invoices/invoice_id/send"];
int numReplacements = [[sbPath Replace: @"invoice_id" replacement: @"INV2-QCHR-QHSD-M2VU-AVXC"] intValue];

[rest AddHeader: @"Authorization" value: [sbAuth GetAsString]];
[rest AddQueryParam: @"notify_merchant" value: @"true"];

NSString *responseBody = [rest FullRequestFormUrlEncoded: @"POST" uriPath: [sbPath GetAsString]];
if (rest.LastMethodSuccess != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

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

// Did we get a 202 accepted response?
if ([rest.ResponseStatusCode intValue] != 202) {
    NSLog(@"%@",responseBody);
    NSLog(@"%@",@"Failed.");
    return;
}

// If the 202 response is received, the response body would be empty...
NSLog(@"%@",@"Success.");