curl --request POST \
  --url https://api.paxos.com/v2/identity/institution-members \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "institution_id": "2908fa8b-427a-4089-b2cf-17654c604623",
  "members": [
    {
      "identity_id": "31abdcbd-2801-4dbc-8986-adec3828391b",
      "roles": [
        "GRANTOR"
      ]
    },
    {
      "identity_id": "58def33e-b68f-47d3-bc2b-62b1f68f21e5",
      "roles": [
        "TRUSTEE"
      ]
    }
  ]
}'

{
  "institution_id": "2908fa8b-427a-4089-b2cf-17654c604623",
  "members": [
    {
      "identity_id": "31abdcbd-2801-4dbc-8986-adec3828391b",
      "roles": [
        "GRANTOR"
      ],
      "id": "23ebbcd3-0fe6-48c8-9a2c-a35572b0e8ba"
    },
    {
      "identity_id": "58def33e-b68f-47d3-bc2b-62b1f68f21e5",
      "roles": [
        "TRUSTEE"
      ],
      "id": "a0a0d270-0dd1-40b7-85ce-de713c47bcec"
    }
  ]
}