Integrating with Elavon
The Elavon payment processor integration ships with CiviCRM https://github.com/civicrm/civicrm-core/blob/master/CRM/Core/Payment/Elavon.php
From Administer &gt; System Settings &gt; Payment Processors, click Add Payment Processor. On New Payment Processor page, for Payment Processor Type, select Elavon Payment Processor and complete the rest of the form before submitting.
This is one of the oldest integrations with CiviCRM, and we have clients who have been happy with it for many years.