Get an opportunity user

curl --request GET \
  --url https://us-central1-siro-prod.cloudfunctions.net/api-externalApi/v1/integrations/opportunity-users/{id}

{
  "id": "<string>",
  "opportunityId": "<string>",
  "userId": "<string>",
  "name": "<string>",
  "amountPercentage": 123,
  "organizationId": "<string>",
  "createdAt": "<string>",
  "updatedAt": "<string>",
  "integrationConnectionId": "<string>"
}