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Use this method to check whether a coupon code was used by the original recipient (e.g., for non-transferable coupons).

**Type**: String


sessionIdStringID of the current session
blockIdlongID of the coupon block
codeStringCoupon code to be queried

**Return values**

Recipient ID of the assigned code (in most cases, this is the recipient's email address)

**Code structure**