Add methods to manage credit cards for customers

[andrewalkermo]

No description provided.

[Copilot]

Pull request overview

This PR adds comprehensive credit card management capabilities for customers, including methods to retrieve, delete, and set default credit cards. The implementation follows a consistent pattern of refactoring gateway methods to accept model objects instead of ID strings, improving type safety and API consistency.

Key changes include:

• Added getCard(), deleteCard(), and setDefaultCard() methods to the MultiPayment class and facade
• Refactored the get() method in Model base class to accept model instances instead of ID strings
• Introduced a refresh() method for reloading model data from gateways
• Added corresponding methods to the MultiPaymentTrait for easy integration with customer models

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 17 comments.

Show a summary per file

File	Description
tests/Unit/MultiPaymentTest.php	Added comprehensive test cases for credit card retrieval, deletion, and default card setting functionality
tests/Unit/Builders/InvoiceBuilderTest.php	Updated to use new refresh() method instead of get() for reloading invoice data
tests/Unit/Builders/CreditCardBuilderTest.php	Refactored to use refresh() method and moved createCustomer helper to base TestCase class
tests/TestCase.php	Added shared createCustomer() helper method for reuse across test classes
src/Traits/MultiPaymentTrait.php	Added three new methods for credit card management: setDefaultCreditCard(), deleteCreditCard(), and defaultCreditCard()
src/MultiPayment.php	Added getCard(), deleteCard(), and setDefaultCard() public methods, refactored getInvoice() and getCustomer() to use model objects
src/Models/Model.php	Changed get() from static to instance method accepting gateway parameter, added delete() and refresh() methods
src/Models/Customer.php	Added setDefaultCard(), getCreditCard(), and deleteCreditCard() methods for managing customer credit cards
src/Gateways/IuguGateway.php	Implemented gateway methods for credit card operations, refactored parsing logic, updated getInvoice() and getCustomer() signatures
src/Facades/MultiPayment.php	Added PHPDoc annotations for new credit card management methods (with some missing)
src/Exceptions/GatewayException.php	Improved error message handling to avoid appending empty error strings
src/Contracts/InvoiceContract.php	Updated getInvoice() signature to accept Invoice object instead of ID string
src/Contracts/CustomerContract.php	Updated getCustomer() signature and added setCustomerDefaultCard() method
src/Contracts/CreditCardContract.php	Added getCreditCard() and deleteCreditCard() method signatures

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