Which constants do you have to set before you can start using Receipt Processing?

The correct answer involves setting specific constants necessary for Receipt Processing to function successfully. In this context, Secret_Key, Access_Key, and Encryption_Key are vital for ensuring secure communication between the receipt processing system and other components, like payment gateways or authentication services.

The Secret_Key is essential for signing requests and verifying the integrity of the data being transferred. The Access_Key allows the application to authenticate to the receipt processing service, ensuring that only authorized applications and users can make transactions or requests. Lastly, the Encryption_Key is used to encrypt the sensitive data during transmission, which is critical for maintaining confidentiality and complying with regulations regarding data security.

While other options mention other keys or tokens, they do not directly relate to the specific constants required to initiate Receipt Processing. They may refer to access tokens or identifiers that facilitate different processes, but they do not encompass the foundational security elements required for the receipt processing setup. Therefore, the combination of Secret_Key, Access_Key, and Encryption_Key is specifically tailored to establish the secure environment necessary for efficiently processing receipts.