Urgent Issue with cloudflare and paypal

When I integrate paypal express payments in my website, I have validation which I do with curl.
However after I added cloudflare it seems like every time I try to do so I get error 500.
I tried so many ways to fix it, creating rule of allowing the specific url, trying to ignore the directory however it doesn;t work, it keeps on showing error 500 when I try to validate payment.
Please help me, its urgent and I am loosing my mind here.

Take a look

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