contextCoupon
The context coupon.
A string array containing the common subject context item names that represent the state of the common context as it was when the most recently committed transaction was completed.
This method can be performed outside the scope of a context change transaction. In this case, the value of the input contextCoupon must denote the most recently committed transaction. This method can also be performed within the scope of a context change transaction that is currently in progress. In this case, the input contextCoupon must denote the current transaction.
For an example refer to JoinCommonContext.