Get patient coupons

Example response

{
  "coupons": [
    {
      "amount_off": 27600,
      "coupon_id": "coupon_abc123",
      "is_active": true,
      "name": "Package: 4 SEDUTE CON GLI ESPERTI",
      "times_redeemed": 2
    }
  ],
  "total": 1
}