A regular Worldpay integration gets your own business paid. Worldpay for Platforms is a different arrangement, built for a software company, think a practice-management tool, a marketplace, or a vertical SaaS product, that wants to let its own customers accept payments through the platform itself, and earn a cut of that payment volume as a revenue line.
Worldpay offers a few different levels of how much of that arrangement a platform takes on itself. A referral model hands most of the underwriting and risk off to Worldpay in exchange for a smaller cut. A payment-facilitator-as-a-service model lets the platform brand the payment experience as its own while Worldpay still handles underwriting and compliance behind it. A full payment-facilitator setup puts the platform in charge of onboarding and risk for its own sub-merchants directly, with the bigger revenue share and bigger responsibility that comes with it.
Which model fits depends on how much risk, compliance work, and support volume a platform is actually ready to own, not just which one pays the most per transaction.