Royal Mail Customer Reference Tracking (for Client-Side App) V1 REST

The Royal Mail Customer Reference Tracking (for Client-Side App) V1 REST
exposes a web service that allows account customers to receive
track-and-trace information for their mail items.

The API is backend for ebusiness and Post Office track and trace webapps of
the Royal Mail website (https://www.royalmail.com/track-your-item [1]) For
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