It is possible to tag coupons, i.e. define who should see certain coupons and who should not. This works as follows:
Keep in mind: Each coupon without a tag is displayed to each participant.
When creating the coupon you will find the field "Tags". For example, enter Tag1 here. You can enter any name for your tags.
When creating the participant list or uploading the participants individually, you must now make sure that the person to whom the coupon is to be displayed also has the tag1.
In this case the participants "tagged" with tag1 get all coupons without tags and the coupon with tag1 displayed and all participants without tag only see the coupons without tags.
That can be extended to many and different tags. Also the name of the tag plays no role, as long as it is the same with the participant and with the coupon.