curl --request POST \
  --url https://api.sequence.app/rpc/Builder/AddAudienceContacts \
  --header 'Content-Type: application/json' \
  --header 'X-Access-Key: <api-key>' \
  --data '
{
  "projectId": 123,
  "audienceId": 123,
  "contacts": [
    {
      "id": 123,
      "audienceId": 123,
      "address": "<string>",
      "createdAt": "<string>",
      "updatedAt": "<string>",
      "name": "<string>",
      "email": "<string>"
    }
  ]
}
'

{
  "ok": true
}