Make online payment integration on the site

Site on a self-written framework
Food delivery service
3 delivery zones and also 3 legal entities of payment
these are restaurants, and there is a rciper (7)
it is necessary to make a bunch of online payment based on the above source data (there is also an electronic cashier and acquiring itself)
and install this bundle on the site, and in the future transfer it to the developer of the application, he will ethrow this bundle into the application.
payment either on a secure transaction or after demonstration and testing - before the transfer of the sources.