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Archive a multiple-use coupon by unpublishing it (is_published becomes false). This endpoint only manages multiple-use coupons. Returns 204 if the coupon is already archived or does not exist (idempotent).

On schools using the new payments experience, archiving a coupon that has not been linked to the payments experience returns 422 "This coupon cannot be archived." This happens for coupons created before the school migrated to the new payments experience and not yet backfilled.