Fix for discount code settings not overriding level settings

[dwanjuki]

All Submissions:

• Have you followed the Contributing guideline?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

The discount code request parameter has a pmpro prefix since 3.0.
Updating the pmpro_checkout_level callback with the pmpro_discount_code request parameter.
Ensures expiration dates from discount codes are applied to the level at checkout.

Resolves #49

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you successfully run tests with your changes locally?

Changelog entry

Fixed issue where expiration dates in discount codes may not be applied.

[Copilot]

Pull request overview

Updates the checkout-level expiration override logic so discount-code expiration settings are applied correctly at checkout when using the (PMPro 3.x) pmpro_discount_code request parameter, addressing issue #49.

Changes:

• Update pmpro_checkout_level callback to read the pmpro_discount_code request parameter when resolving the discount code ID.
• Minor formatting: add a trailing newline at end of file.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.