Are you using a Third Party Payment Gateway System? Sorry but we are not integrated with any third party payment systems. You can always try a third party payment system but when testing using The Facebook Pixel Helper and you don’t see the Purchase Pixel on the Thank You Page then it doesn’t work then all we can do is recommend using the Standard payment methods built into Shopify.
James (Tech Support)
Get Pixel Conversions API on the Shopify App Store
P.S. your 5 star experience is our goal.
Thanks again from all of us here at Pixel Conversion Pro and remember, you are Awesome!