EReceiptSequenceExample.m

@implementation ViewController
  
//this only needs to be done *ONCE* unless the user chooses to unlink the account at some later time
- (IBAction)btnLinkTouched:(id)sender {
  
  [[BREReceiptManager shared] setupIMAPForProvider:BREReceiptProviderGmail
                                      viewController:self
                                      withCompletion:^(BRSetupIMAPResult result) {
                                        if (result == BRSetupIMAPResultCreatedAppPassword) {
                                          NSLog(@"Account linking successful");
                                          //At this point you would store something internally to indicate that the user has a linked account
                                          //Such as using NSUserDefaults or the keychain or your own backend...
                                        }
                                      }
}
  
   
//this would be done every time you want to grab new email from the user's linked account, which could be based on a user action
//like I have it set up here (a button press) OR could be something you trigger behind the scenes at any time
- (IBAction)btnGrabEmails:(id)sender {
  
  //Here you might first add a check to make sure that the user actually does have a linked account, which would be based on your own
  //internal state, as discussed above
  
  //if you wanted you could first verify the account by calling `[[BREReceiptManager shared] verifyImapCredentials:]`
  //and then only upon verification success, you would call the below
   [[BREReceiptManager shared] getEReceiptsWithCompletion:^(NSArray *scanResults, NSError *error) {
        NSLog(@"Found %lu new e-receipt orders", (unsigned long)scanResults.count);
   }
}
  
@end