External reference to this order.

[Optional] The tracking reference, if tracking has been used by the calling application

Client ID, This will be provided by EES and is unique to the company calling the API.

Request Security Hash, calculated using SHA-256 function from concatenated full Request URI Path with Query String(s), Payload and Client Secret

This general HTTP header controls (or rather influences) whether the network connection stays open after the current transaction finishes. If the sent value is keep-alive, the connection should stay in a special state, allowing to be reused for subsequent requests to the same server. Please note these connections will be closed after reaching timeout threshold by server (usually after 5 seconds).

This request HTTP header advertises which content encoding (usually a compression algorithm) the calling application is able to understand. The server selects one of the proposals, use it and informs the client of its choice with the Content-Encoding response header. Currently supported gzip and deflate, if request header not present no compression will be used.

Unique Reference for the API transaction within the calling company.

This flag denotes the number of attempts that have been made for this request.

Optional header provided by the calling application for EES AIR to identify what was the external Subsystem Id / Name.

Optional header(s) provided by the calling application to EES AIR. Please note this header name has to follow pattern X-CUSTOM-*