I have the plugin setup for my initial offer in ClickFunnels. However, when they go to PayPal to pay, they can complete the purchase however after that they are not redirected to my OTO page, it simply gives them a 404 error when they click "go back to the merchants website. How are we able to make PayPal redirect them to the OTO page after they purchase?
That’s very common mistake, that usually means, you forgot to add a Thank you page to our platform (or the one u added doesn’t exist). simply add a thank you page to the platform and it will work just fine.
As for the “return to merchant” you can make it automatic, that when your customers pay they get redirected to the next OTO automatically, without having to take any action. read the following guide about that: