Add the recipient ID under the new header x-request-meta with recipient-id in a JSON object which is theidentifier of the receiver to whom the API call needs to be forwarded.
The value of the x-request-meta is Base64 string of the JSON object with recipient-id.
This strucutre helps us to easily extend the JSON object by adding the required attributes for future use cases.
x-request-meta: <Base64 of JSON object
{"recipient-id":"<unique identifier of the receiver>"}>