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We use basic authentication over secure http (HTTPS). Basic authentication is a method for an HTTP user agent (e.g. a web browser) to provide a user name and password when making a request. In our case, by using basic HTTP authentication, a request contains a header field in the form of
Authorization: Basic <API-Key>where
<API-Key>is the base-64 encoded string of
Typically customer who has implemented our service in backend using Java, C#,PHP or Curl etc. will not require any referrer domains to be allowlisted as the back end implementation is already secured enough as the call happens from server side.