Here is only example, but my domain is similar to this example.Hello @November!
PAYHASTA is confusingly similar to the HASTAPAY and there is a high possibility the Complainant (Hastapay) would succeed on the first element, in my opinion.
Is there a trademark infrigement if someone register PAYHASTA.COM?
Yes, BUT ONLY IF Complainant prove the second and third UDRP elements.