Iframe 403 forbidden

I upgraded to Cloudflare Pro yesterday. Ever since then one of my payment options cannot communicate back to my site letting me know that the payment was complete (payment is successful and completed on the payment processor end. In checking with them they are telling me that they are getting it 403 forbidden notice when they try to communicate back with my site. Please note, they use eye frame on the site.

Has anyone ever run into this issue or have any suggestions? TIA

Is this any help?:

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