Contributing updated, comments added to combination example

CONTRIBUTING.md

@@ -16,8 +16,6 @@
 
 
 ### Contribution to refactoring:
-- branch should be created from refactoring
-- code changes should follow Magento2 coding standard
 - include unit tests
 - open the Pull Request
 - check that git workflows checks have passed

example/transactions/credit_management.php

@@ -7,6 +7,10 @@
 
 $buckaroo = new Buckaroo($_ENV['BPE_WEBSITE_KEY'], $_ENV['BPE_SECRET_KEY']);
 
+// Sometimes we need to combine multiple payments.
+// By adding "manually," it will not execute immediately but rather return the built payload.
+// With the returned payload, we can combine it with the next payment.
+
 $invoice = $buckaroo->payment('credit_management')->manually()->createCombinedInvoice([
                 'invoice'               => str_random(),
                 'applyStartRecurrent'   => 'False',
@@ -51,6 +55,8 @@
                 ]
             ]);
 
+// In this case, we have the payload stored in the $invoice variable. We can now combine it with the next payment using the combine method
+
 $response = $buckaroo->payment('sepadirectdebit')->combine($invoice)->pay([
     'invoice'           => uniqid(),
     'amountDebit'       => 10.10,