First, we need two websites: one website A (selling replica products) and one website B (selling regular everyday items). We promote website A, and when buyers visit website A to purchase replica products, they choose PayPal as the payment method at checkout.
When they click the checkout button, the PayPal account from website B pops up, prompting the buyer to pay, without the buyer knowing that it’s website B's PayPal account. From PayPal's perspective, it detects a regular product sale from website B, so it pops up the PayPal payment window.
After the buyer completes the payment, the money successfully goes into PayPal, the payment data is passed back to website B, and website B then passes it back to website A.
This is the process of AB site payment redirection.
In practice, when using AB site payment redirection, it often involves round-robin payment collection, where multiple PayPal or Stripe accounts are prepared to collect payments in rotation. Chinese merchants are using this method to sell replica products. I am Chinese, so feel free to ask me any questions.