Hashing the API Key
Construct the X-Auth-Key header as follows:
md5(api_key + md5(url + X-Auth-User + api_key + X-Auth-Expires))-
The + operator indicates string concatenation without any delimiters.
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Enter each parameter in this expression as a string.
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The url parameter is the path portion of the request URL minus any query parameters and without any API version prefix. It must not have a trailing slash.
The hash is valid for a single access: it is not persisted.
