Returns the Opt In Status of an email address via an http form post.
| Field | Max Length | Required | Notes |
|---|---|---|---|
| response_type | false | Default results will be returned in XML. Set this field value to json to return results in JSON format | |
| accountid | true | Must be numeric. Account ID for this account. Found in Settings > API Settings or for White Label CRM in the Admin control panel | |
| apikey | true | API Key for this account. Found in Settings > API Settings or for White Label CRM in the Admin control panel | |
| 75 | true |