curl --request GET \
  --url https://api.payvessel.com/api/v1/biller-reseller/billers/{biller_id}/items \
  --header 'api-key: <api-key>' \
  --header 'api-secret: <api-key>'

{
  "status": true,
  "message": "<string>",
  "data": [
    {
      "biller_id": "<string>",
      "item_id": "<string>",
      "item_name": "<string>",
      "amount": 123,
      "min_amount": 123,
      "max_amount": 123,
      "is_fix_amount": 123,
      "status": 123,
      "ext_info": {
        "validity_date": 123,
        "item_size": "<string>",
        "item_description": {}
      }
    }
  ]
}