- Added missing PHPdocs
- Corrected Syntax
- Added noinspection parameters to PHPdoc for AJAX called functions
- Added missing function return types
- Added missing parameter types
- Added public keyword to functions without visibility modifier
- Corrected incorrectly formatted PHPdocs
- Added public to constants and functions missing a visibility keyword
- when the payments array was folded into sale_data there was an earlier payments[] reference in the foreach loop that didn't get folded in.
- Update PHPdoc
- Added ::class to remove polymorphic call warning
- Removed unreachable 'break;' statement after return statement.
- Added missing return type
- fixed missing assignment of mailchimp_api_key
