New Payment Gateway (Malaysia) and Opencart Marketplace customization (Webkul)

I want to create new payment gateway module to replace my current payment gateway that i using in seller profile. The new payment gateway is for opencart marketplace module (Webkul). The new payment gateway (Malaysia): It must contain 2 type of payment method 1) Online Transfer (buyer can direct pay to seller through credit card or visa card) such as payapl and other online payment gateway. I will saw you some Malaysia payment gateway list: [login to view URL] [login to view URL] [login to view URL] I want you study the link that i sent to you then you let me know how are you going to process it 2) Bank Transfer (Malaysia): The bank list you can refer to my admin panel there got a lot of malaysia payment gateway (find the install one) the process like that: buyer can review the payment method that seller set in their seller profile ([login to view URL]) after that when buyer can go to pay at the checkout page they can choose either using online tansfer or bank transfer. If they using online transfer they have to enter their credit card information if they choosing bank transferm they can choose the bank from the list that seller had been set up, after they choosing they need to attach the bank receipt to show the payment had been paid. Both payment gateway must have email & sms notification after the payment had been made. For Opencart Marketplace multi vendor module: (Please refer the document below) 1) Add in cover banner with slider function and autoscroll feature for Seller Profile 2) Change location information for opencart marketplace (currently the location is base on City, i want to change from base on City to base on latittude and longtitude