Add feature to set a customer number when signing up.
Add getter for customer number.
Provide unit and integration tests for customer number on sign up.
Remove sign up method changes for customer number in library.
Update unit tests to missing customer number sign up.
Add feature to set order number on order creation.
Add getter for order number.
Provide tests for order creation with order number.
Remove additional method to sign up in SDK.
Fix typo.
Fix typo.
Remove unnecessary annotation.
Update CHANGES.md with customer and order numbers.