PUT api/2.0/group/{groupid}/members This function requires authentication

Add new group users keeping the current users and adding new ones

PUT api/2.0/group/9924256A-739C-462b-AF15-E652A3B1B6EB/members
Host: yourportal.onlyoffice.com
Content-Type: application/json
Accept: application/json

{
  "members": [
    "00000000-0000-0000-0000-000000000000"
  ]
}

application/json

{
  "status": 0,
  "response": {
    "id": "9164176c-2003-482f-a861-f74c39261c6e",
    "name": "Sample group",
    "category": "46c1482f-edb2-4ef3-abe6-fe79732f03ec",
    "parent": "e2a533a6-f7ab-434d-bb89-bbbed893bba7",
    "description": null,
    "manager": {
      "id": "00000000-0000-0000-0000-000000000000",
      "displayName": "Mike Zanyatski",
      "title": "Manager",
      "avatarSmall": "url to small avatar",
      "profileUrl": ""
    },
    "members": [
      {
        "id": "00000000-0000-0000-0000-000000000000",
        "displayName": "Mike Zanyatski",
        "title": "Manager",
        "avatarSmall": "url to small avatar",
        "profileUrl": ""
      }
    ]
  }
}

text/xml

<result>
  <status>0</status>
  <response>
    <id>9164176c-2003-482f-a861-f74c39261c6e</id>
    <name>Sample group</name>
    <category>46c1482f-edb2-4ef3-abe6-fe79732f03ec</category>
    <parent>e2a533a6-f7ab-434d-bb89-bbbed893bba7</parent>
    <description />
    <manager>
      <id>00000000-0000-0000-0000-000000000000</id>
      <displayName>Mike Zanyatski</displayName>
      <title>Manager</title>
      <avatarSmall>url to small avatar</avatarSmall>
      <profileUrl></profileUrl>
    </manager>
    <members>
      <id>00000000-0000-0000-0000-000000000000</id>
      <displayName>Mike Zanyatski</displayName>
      <title>Manager</title>
      <avatarSmall>url to small avatar</avatarSmall>
      <profileUrl></profileUrl>
    </members>
  </response>
</result>