This extension provides a wrapper extension for payment processors.
Note that the IPN/ Silent post url that should be configured within the payment processor is
http(s)://yousite/civicrm/payment/ipn/xx where xx is the payment processor ID.
(I'm not quite sure the joomla & WP variants but will update when I do)
How to add new payment gateways to Omnipay
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update composer.json and run composer update
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edit CRM/Core/Payment/processors.mgd.php - check notes in that file for syntax