How to add custom payment methods with redirect link

[Somaya]

Hello everyone,

if you could help me in my problem I will be very grateful.

when the buyer choose Paypal payment and confirmed his order , instead of transform him to admin account in Paypal  , I want to transform him to Paypal home page and he can login and transfer money to any one he want.

And I want to add 4 option for buyer when he choose payment method , the 4 option is for home page to 4 banks so if he click confirm order it will redirect him immediately to the bank home page.

could tell me how the coding would be for one custom method.

Thank you in advance