The integration of receipts for use in identity management protocols is a long standing topic with UMA (User Managed Access) at Kantara.
The objective of this use case is to specify the use of receipts in UMA.
Since this topic started there have been considerable advancement in the Identity Management industry. Besides UMA, there are now 2 more protocols,( besides OAuth )which the consent notice receipt should work with.
The aim is to start hosting regular workshops on this topic stay tuned for more information