Authorize

The authorize request is the first step the merchant POS will call when the customer enters a fuel code at the pump or inside the store. 1. All independent requests will have unique transaction ids 2. The `authorized_flag` determines whether the authorization was successful. I.e. an HTTP 200 call with `authorized_flag: false` is considered a valid response (where the authorization is declined). 3. There are 3 ways to limit the authorization, please review the docs on limits. The authorize response will include a `voids_at` field which specifies when this authorization will expire. The POS must abide by this field and not allow capture calls after the deadline ends (typically 24 hours). This endpoint will not return products which are not listed in the `available_fuel` field.