curl --location --request POST '/admin/coupons' \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data-raw '{
"code": "string",
"value_usd": 1,
"coupon_scope": "user_specific",
"max_uses": 1,
"valid_until": "2019-08-24T14:15:22Z",
"coupon_type": "promotional",
"assigned_to_user_id": 0,
"description": "string",
"valid_from": "2019-08-24T14:15:22Z"
}'{
"id": 0,
"code": "string",
"value_usd": 0,
"coupon_scope": "string",
"coupon_type": "string",
"max_uses": 0,
"times_used": 0,
"valid_from": "2019-08-24T14:15:22Z",
"valid_until": "2019-08-24T14:15:22Z",
"is_active": true,
"created_at": "2019-08-24T14:15:22Z",
"assigned_to_user_id": 0,
"created_by": 0,
"created_by_type": "string",
"description": "string"
}