Value

This element designates the cryptocurrency or payment layer that will be used, the transport method for transacting the payments, and a suggested amount denominated in the given cryptocurrency.

This element can exist at either the <channel> or <item> level. When it exists at the <item> level, it should be treated as an "override" of whatever is defined at the <channel> level.

This is a complex tag, so implementors are HIGHLY encouraged to read the companion document for a complete understanding of how this tag works and what it is capable of.