I have set up FB shop on by business page. I tried to use PayPal to accept payments but it did not work. I have a verified PP business account. So I had to set up Stripe. I went in, loaded a product then went in and bought an item myself from an offer I created on my FB page. But I do not find anywhere in the checkout process to add a discount code. Can you answer how I can get a discount code to be used at checkout. And how to set up PayPal?
I’m sorry! I’ve found directly launching a Facebook Shop difficult and cumbersome, and hard to connect payments etc. Basically, I couldn’t get it all to work smoothly, like you, and needed to spend my time doing other things. Facebook’s documentation isn’t great and their customer service is nonexistent. So So, I’ve always used the $9 Shopify Lite plan which gives you a seamless connection to Facebook Shop, lets you use Shopify’s many payment integrations, plus gives you other selling features – and customer service.
Sorry I couldn’t help with your immediate problem, but the Shopify/Facebook solution works great if you want to check it out further.