curl --request POST \
  --url https://us.infisical.com/api/v1/cert-manager/applications/{applicationId}/identities/{identityId} \
  --header 'Content-Type: application/json' \
  --data '
{
  "role": "<string>"
}
'

{
  "membership": {
    "membershipId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "applicationId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "role": "<string>",
    "createdAt": "2023-11-07T05:31:56Z",
    "updatedAt": "2023-11-07T05:31:56Z",
    "actorUserId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "actorIdentityId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "actorGroupId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "customRoleId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "details": {
      "name": "<string>",
      "email": "<string>",
      "username": "<string>",
      "authMethod": "<string>",
      "slug": "<string>"
    }
  }
}