BA-1101: Remove Billink authorize/capture flow

[vildanbina]

No description provided.

[Copilot]

Pull request overview

This PR removes the authorize/capture flow for the Billink payment method, simplifying it to use only a direct payment (combined) flow. The changes eliminate code that supported a two-step payment process where authorization and capture were separate operations.

Key changes:

• Removed authorize, capture, and cancelAuthorize methods from the Billink payment class
• Deleted the Capture model class that was specific to the capture operation
• Removed associated test cases for authorize/capture flows

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/PaymentMethods/Billink/Billink.php	Removed authorize(), capture(), and cancelAuthorize() methods and the Capture model import
src/PaymentMethods/Billink/Models/Capture.php	Deleted entire Capture model class file
example/transactions/billink.php	Removed example code demonstrating authorize, capture, and cancelAuthorize operations; added clarifying comment for pay method
tests/Buckaroo/Payments/BillinkTest.php	Removed test cases for authorize and capture operations

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