POST api/RSVPRegistration/Create

{
  "item": {
    "id": "sample string 1",
    "refNo": "sample string 2",
    "name": "sample string 3",
    "contactNo": "sample string 4",
    "email": "sample string 5",
    "company": "sample string 6",
    "position": "sample string 7",
    "refID": "sample string 8",
    "createDate": "2025-12-06T14:02:37.7669449+08:00",
    "updateDate": "2025-12-06T14:02:37.7669449+08:00",
    "isEnable": true
  },
  "items": [
    {
      "id": "sample string 1",
      "refNo": "sample string 2",
      "name": "sample string 3",
      "contactNo": "sample string 4",
      "email": "sample string 5",
      "company": "sample string 6",
      "position": "sample string 7",
      "refID": "sample string 8",
      "createDate": "2025-12-06T14:02:37.7669449+08:00",
      "updateDate": "2025-12-06T14:02:37.7669449+08:00",
      "isEnable": true
    },
    {
      "id": "sample string 1",
      "refNo": "sample string 2",
      "name": "sample string 3",
      "contactNo": "sample string 4",
      "email": "sample string 5",
      "company": "sample string 6",
      "position": "sample string 7",
      "refID": "sample string 8",
      "createDate": "2025-12-06T14:02:37.7669449+08:00",
      "updateDate": "2025-12-06T14:02:37.7669449+08:00",
      "isEnable": true
    }
  ]
}

<RSVPRegistrationModels xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/Services.Models">
  <item xmlns:d2p1="http://schemas.datacontract.org/2004/07/GenericDA.Models">
    <d2p1:company>sample string 6</d2p1:company>
    <d2p1:contactNo>sample string 4</d2p1:contactNo>
    <d2p1:createDate>2025-12-06T14:02:37.7669449+08:00</d2p1:createDate>
    <d2p1:email>sample string 5</d2p1:email>
    <d2p1:id>sample string 1</d2p1:id>
    <d2p1:isEnable>true</d2p1:isEnable>
    <d2p1:name>sample string 3</d2p1:name>
    <d2p1:position>sample string 7</d2p1:position>
    <d2p1:refID>sample string 8</d2p1:refID>
    <d2p1:refNo>sample string 2</d2p1:refNo>
    <d2p1:updateDate>2025-12-06T14:02:37.7669449+08:00</d2p1:updateDate>
  </item>
  <items xmlns:d2p1="http://schemas.datacontract.org/2004/07/GenericDA.Models">
    <d2p1:RSVPRegistration>
      <d2p1:company>sample string 6</d2p1:company>
      <d2p1:contactNo>sample string 4</d2p1:contactNo>
      <d2p1:createDate>2025-12-06T14:02:37.7669449+08:00</d2p1:createDate>
      <d2p1:email>sample string 5</d2p1:email>
      <d2p1:id>sample string 1</d2p1:id>
      <d2p1:isEnable>true</d2p1:isEnable>
      <d2p1:name>sample string 3</d2p1:name>
      <d2p1:position>sample string 7</d2p1:position>
      <d2p1:refID>sample string 8</d2p1:refID>
      <d2p1:refNo>sample string 2</d2p1:refNo>
      <d2p1:updateDate>2025-12-06T14:02:37.7669449+08:00</d2p1:updateDate>
    </d2p1:RSVPRegistration>
    <d2p1:RSVPRegistration>
      <d2p1:company>sample string 6</d2p1:company>
      <d2p1:contactNo>sample string 4</d2p1:contactNo>
      <d2p1:createDate>2025-12-06T14:02:37.7669449+08:00</d2p1:createDate>
      <d2p1:email>sample string 5</d2p1:email>
      <d2p1:id>sample string 1</d2p1:id>
      <d2p1:isEnable>true</d2p1:isEnable>
      <d2p1:name>sample string 3</d2p1:name>
      <d2p1:position>sample string 7</d2p1:position>
      <d2p1:refID>sample string 8</d2p1:refID>
      <d2p1:refNo>sample string 2</d2p1:refNo>
      <d2p1:updateDate>2025-12-06T14:02:37.7669449+08:00</d2p1:updateDate>
    </d2p1:RSVPRegistration>
  </items>
</RSVPRegistrationModels>

Sample not available.