Add support for issuing refunds via the payment UI for payment processors that support refunds (eg. Stripe).

load CRM.payment via coreResourceList so it is added everywhere CiviCRM is loaded (eg. drupal_webform etc)

Add 'Install now' to minifier/contributiontransactlegacy extensions now they are available for automated distribution

Add workaround for #17777 so receive_date is not updated on contribution (<5.29). Wrap workaround for order_reference in (<5.27) block

Don't trigger exception if payment processor ID not found for IPN, use debug function because we don't have access to getPaymentProcessorLabel() function

Refactor Mjwpayment.get_contribution so it accepts order_reference and trxn_id params and returns a single contribution with matching payments

Use Mjwpayment.create_payment instead of Payment.create API in updateContributionRefund() for compatibility with multiple versions of CiviCRM