The unique payment attempt identifier generated by the POS terminal that was sent in the request to POST /v1/instore/order/create or POST /v1/instore/order/scan.

Header required for authorization. Specify the HMAC signature in the Authorization header along with accessKeyId. Please refer to Generating an HMAC Signature for a step by step guide to generating the Authorization signature.

The date and time of request in <a href=https://en.wikipedia.org/wiki/ISO_8601 target="_blank">ISO-8601 format. This should be the same value used in the generation of the HMAC signature

Idempotent Id for the request. If this is absent, every request will be treated as unique and will be processed as such. (This is optional for now, but will be made required in the future)