Is your business PayPal new? Because if it is it’s so hard to integrate it to ur store trust me I tried for over a month I was almost really to give up.
But what I did was I had another PayPal business account that I would sell used goods on eBay for about 3 to 4 years so that account was clean and old so PayPal knows that account Is legit and ships out and that,All I did was change the settings and details from that account to my now own business on Shopify, now I get payments right away and it got integrated easily I didn’t have to pay someone money to do it for me.
If you have an older PayPal business account try doing that changing that account into ur shopify business Account and not ebay or amazon seller account.
let me know if you understood if you don’t then message me, I would be glad to help 