Hi, @G4GBoutique !
Welcome to Shopify Community.
Thank you for sharing your question with our network. If your store is located in the United States region and you have opted in for checkout on Facebook & Instagram, then you will also have to connect your PayPal account through their settings.
This is different from your Payment settings found in your Shopify account. To access them, you can add this to the end of your .myshopify.com URL:
/admin/settings/apps/app_installations/app/facebook-ads/payments
Let’s say your .myshopify.com URL was example.myshopify.com, then you would go to example.myshopify.com/admin/settings/apps/app_installations/app/facebook-ads/payments
That will bring you to your Facebook & Instagram payment options settings where you can enter the desired information. If the banner does not automatically disappear after connecting the payment information, please connect with Meta Support from the Facebook Channel in your Admin.
I trust that helps,