Informs a participant in a common context session that a change to the common context data is pending.
contextCoupon
The transaction within which the context changes occurred.
reason
The reason provided by the participant if it cannot accept the changes.
The decision the participant made about the changes.
For an application that accepts the changes, the value of the output decision shall be "accept" and the value of the output reason shall be an empty string. For an application that conditionally accepts the changes, the value of the output decision shall be "conditionally_accept".
For an example refer to JoinCommonContext.