Reply to emails

mutation replyToEmail($input: ReplyToEmailInput!) {
  replyToEmail(input: $input) {
    email {
      id
    }
    error {
      message
      type
      code
    }
  }
}

{
  "input": {
    "customerId": "c_01GTC6ZHCMAGR06FMPN9VY5J95",
    "inReplyToEmailId": "em_01GM2X8K7D3RZ7ZFGHZ2AYG3SA",
    "textContent": "The plain text version of your reply goes here.",
    "markdownContent": "The markdown **version** of your _reply_ goes here."
  }
}