Reply To: Adding a new custom gateway

If it’s not using a form submit to get the data required it is not compatible. If you can get that url at the point of code where you make the form you could set it as target.
What I still don’t get is how you get something in return when the user submits the form and what sense that would make. You already sent them all your informations so for what do you need the URL at all? Why no strict url like with paypal?