curl -i -X POST "https://api.box.com/2.0/group_memberships" \
     -H "authorization: Bearer <ACCESS_TOKEN>" \
     -H "content-type: application/json" \
     -d '{
       "user": {
         "id": "1434325"
       },
       "group": {
         "id": "4545523"
       }
     }'

client.memberships.create_group_membership(
    CreateGroupMembershipUser(id=user.id), CreateGroupMembershipGroup(id=group.id)
)

await client.memberships.createGroupMembership({
  user: { id: user.id } satisfies CreateGroupMembershipRequestBodyUserField,
  group: { id: group.id } satisfies CreateGroupMembershipRequestBodyGroupField,
} satisfies CreateGroupMembershipRequestBody);

try await client.memberships.createGroupMembership(requestBody: CreateGroupMembershipRequestBody(user: CreateGroupMembershipRequestBodyUserField(id: user.id), group: CreateGroupMembershipRequestBodyGroupField(id: group.id)))

client.getMemberships().createGroupMembership(new CreateGroupMembershipRequestBody(new CreateGroupMembershipRequestBodyUserField(user.getId()), new CreateGroupMembershipRequestBodyGroupField(group.getId())))

await client.Memberships.CreateGroupMembershipAsync(requestBody: new CreateGroupMembershipRequestBody(user: new CreateGroupMembershipRequestBodyUserField(id: user.Id), group: new CreateGroupMembershipRequestBodyGroupField(id: group.Id)));

{
  "id": "11446498",
  "type": "group_membership",
  "user": {
    "id": "11446498",
    "type": "user",
    "name": "Aaron Levie",
    "login": "ceo@example.com"
  },
  "group": {
    "id": "11446498",
    "type": "group",
    "name": "Support",
    "group_type": "managed_group"
  },
  "role": "member",
  "created_at": "2012-12-12T10:53:43-08:00",
  "modified_at": "2012-12-12T10:53:43-08:00"
}

{
  "type": "error",
  "status": 400,
  "code": "item_name_invalid",
  "message": "Method Not Allowed",
  "context_info": {
    "message": "Something went wrong"
  },
  "help_url": "https://developer.box.com/guides/api-calls/permissions-and-errors/common-errors/",
  "request_id": "abcdef123456"
}

{
  "type": "error",
  "status": 400,
  "code": "item_name_invalid",
  "message": "Method Not Allowed",
  "context_info": {
    "message": "Something went wrong"
  },
  "help_url": "https://developer.box.com/guides/api-calls/permissions-and-errors/common-errors/",
  "request_id": "abcdef123456"
}