List plans

curl -X GET "https://api.live.paisr.tech/v2/plans" \
  -H "Authorization: Bearer <access_token>" \
  -H "User-Agent: MyApp/1.0" \
  -H "Content-Type: application/json"

{
  "success": true,
  "data": {
    "plans": [
      {
        "id": "pln_123456",
        "title": "Premium Service",
        "summary": "Get started with using our premium service.",
        "type": "standard",
        "currency": "SRD",
        "created_at": "2024-01-15T10:30:00Z",
        "options": [
          {
            "id": "plo_123456",
            "description": "Monthly",
            "active": true,
            "unit_price": 9.99,
            "billing_interval": 30,
            "subscribers": 10,
            "attributes": {},
            "created_at": "2024-01-15T10:30:00Z"
          }
        ]
      }
    ]
  }
}