curl --request GET \
  --url https://api.shoppex.io/dev/v1/customers/{id}/wallet \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "wallet": {
      "id": "wallet_1",
      "balance": 15,
      "hold_balance": 2.5,
      "available": 12.5,
      "currency": "EUR",
      "is_active": true
    }
  }
}