Issue in Integrating Telr Payment

i have send data to gateway using curl and then i redirect to payment page
then i got error
after submitting card details
it shows invalid method
doc also showing same method

https://dev.to/mohammedaktaa/how-to-use-telr-hosted-and-remote-1kk0
i use this for reference
this is final error {"method":"unknown","trace":"4000/13088/5f9809fd","error":{"message":"E01:Invalid request","note":"Unknown method"}}