[x] Does your code follow the Extendables standards?
[ ] Have you written new tests for your changes, as applicable?
[x] Have you successfully run tests with your changes locally?
Changes proposed in this Pull Request:
Closes # .
How to test the changes in this Pull Request:
Rest routes registered in includes/class-wc-amazon-payments-advanced-rest-api-controller.php by WC_Amazon_Payments_Advanced_REST_API_Controller::register_routes should function as expected and correctly identifing if the provided order id refers to an actual order completed through Amazon Pay
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[x] Have you checked to ensure there aren't other open Pull Requests for the same update/change?
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Changes proposed in this Pull Request:
Closes # .
How to test the changes in this Pull Request:
Other information:
Changelog entry