Anyone can integrate payment gateway and make it an installable plugin for J3 VirtueMart 3 ? The gateway named Billplz, documentation is here [url removed, login to view] . I can send Woocommerce plugin (workable) for Billplz for your reference. I can send Virtuemart plugin for other gateway as sample. I will provide API KEY, Collection ID, X_Signature key as required by the gateway .