We require an HTTP header to authenticate every request to the TelePay API.
The header is AUTHORIZATION and the content is your merchant private API key.
Example:
AUTHORIZATION: secret_JQWG5UEPPF7J6ZVIWF04I5BD6Q64EQM6LWSRZ2Q4NJMNWWYPHNM790ATC8BO5LRLTUXLRS53JS5VAKOAK8HGNN0PEF6P6YK1ZAFL
Any requests without this authentication header will result in error 403.