The Purchase Channel enumeration describes the modality of purchase, such as in-store or via an app.

Value	Description
InStore	Valid for purchases within or at the physical store location.
Online	Valid via online shopping with the merchant.
PayAtPump	For gas station offers, indicates that the purchase can/must be made at the fuel pump.
App	Valid for purchases using the merchant's mobile app. May be used to indicate app-only purchases or may be combined with `Online`.
Convenience	Valid for purchases within or at the physical convenience store location.

Note that new values may be added in the future and clients should gracefully handle/ignore any unknown/new values.