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hi i am registering my pos with this example
https://developers.deliverect.com/reference/post-register-pos
after putting my pos url in Register POS URL field submitted register button, it shows

"Failed to register POS: The request made to the the POS Registration URL returned an invalid HTTP status code: 406".

have already tested by changing my url method post and get both but its still not working. also returning with response as shown in document example.

is there anything i am missing.