Add Referer header to Zibal requests

[AzadGh95]

Description

Added configurable Referer support to Zibal payment requests.

The referer option is now available in the Zibal driver configuration and defaults to null. When configured, it is sent as the Referer header in both purchase and verification requests; otherwise, the header is omitted.

Motivation and context

Zibal requires a Referer header in payment requests by September 11 (20 Shahrivar). Making the value configurable lets applications provide their approved domain without coupling the driver to Laravel’s app.url configuration.

Responsible team: Backend Team

How has this been tested?

Added unit tests covering both Zibal purchase and verification requests:

• The configured referer value is sent as the Referer header.
• The header is omitted when referer remains at its default null value.

Screenshots (if appropriate)

Not applicable.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have read the CONTRIBUTING document.
• My pull request addresses exactly one patch/feature.
• I have created a branch for this patch/feature.
• Each individual commit in the pull request is meaningful.
• I have added tests to cover my changes.
• If my change requires a change to the documentation, I have updated it accordingly.

[khanzadimahdi]

could you please fix the failed pipelines?

hint: this package is not a laravel package but a pure PHP package. Laravel / symfony or any functions are not available in this package. you can rely on the config object that is injected to the driver.

[codecov-commenter]

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Additional details and impacted files

@@            Coverage Diff            @@
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  Coverage          ?   79.61%           
  Complexity        ?     1041           
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  Files             ?       65           
  Lines             ?     5499           
  Branches          ?        0           
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  Hits              ?     4378           
  Misses            ?     1121           
  Partials          ?        0           

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