Payement gateway for high/mid risk projects

[Telifon]

stay away from this asshole, he is scammer
he contacted me, ask me to pay for the payment gateway. I asked him "pay what"? he started shit talking "you are just an asshole Asians only want free shit, right?" like he was trying to prove him very confident.
I asked him give more details about your payment gateway, what is the policy, transaction fee, max volume, intergration framework, .... alot of things related to a payment gateway that a webmaster need to know. But he knows nothing of them, told me that pay him first and these details will come later after payments =))) I ask him how to install the payment gateway, he said it can install on everything, Windows, Mac, Linux or even on my phone.
I ask him do you even know what is a payment gateway? He started swearing and deleted the chat.