Domain renewal (Grace Period ending in 2 days) payments not going through.

I'm receiving the error message after trying to confirm my payment to renew my domain:
API Request Failed: POST /api/v4/zones/[REDACTED_zone_info_etc.]/registrar/domains/[my_domain_name]/renew (504)

not sure what this means.
been trying to pay all day, I hope it doesn't drag on until I have to pay Redemption Period fees; or worse til I lose my domain.
can't figure out if there's something I can do to make it work, is the problem on my side or cloudflare's?
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