Automatically sending newsletter subscribers from InstaWP to Mailchimp

This GraphQL query captures the email from the visitors who ticked the "Subscribe to mailing list" checkbox from InstaWP (when creating a new sandbox site), and subscribes this email to a Mailchimp list:

query HasSubscribedToNewsletter {
  hasSubscriberOptin: _httpRequestHasParam(name: "marketing_optin")
  subscriberOptin: _httpRequestStringParam(name: "marketing_optin")
  isNotSubscriberOptinNAValue: _notEquals(value1: $__subscriberOptin, value2: "NA")
  subscribedToNewsletter: _and(values: [$__hasSubscriberOptin, $__isNotSubscriberOptinNAValue])
    @export(as: "subscribedToNewsletter")
}

query MaybeCreateContactOnMailchimp
   @depends(on: "HasSubscribedToNewsletter")
   @include(if: $subscribedToNewsletter)
{
  subscriberEmail: _httpRequestStringParam(name: "email")
  
  mailchimpUsername: _env(name: "MAILCHIMP_API_CREDENTIALS_USERNAME")
    @remove
  mailchimpPassword: _env(name: "MAILCHIMP_API_CREDENTIALS_PASSWORD")
    @remove
  
  mailchimpListMembersJSONObject: _sendJSONObjectItemHTTPRequest(input: {
    url: "https://us7.api.mailchimp.com/3.0/lists/{listCode}/members",
    method: POST,
    options: {
      auth: {
        username: $__mailchimpUsername,
        password: $__mailchimpPassword
      },
      json: {
        email_address: $__subscriberEmail,
        status: "subscribed"
      }
    }
  })
}

And define in wp-config.php:

define( 'MAILCHIMP_API_CREDENTIALS_USERNAME', '{ username }' );
define( 'MAILCHIMP_API_CREDENTIALS_PASSWORD', '{ password }' );

Step by step analysis of the GraphQL query permalink

Read blog posts:

• 🚀 Automatically sending the newsletter subscribers from InstaWP to Mailchimp
• 👨🏻‍🏫 GraphQL query to automatically send the newsletter subscribers from InstaWP to Mailchimp

Extensions referenced in this recipe permalink

• Field Response Removal
• Field To Input
• HTTP Client
• HTTP Request via Schema
• Multiple Query Execution
• PHP Constants and Environment Variables via Schema
• PHP Functions via Schema
• Response Error Trigger

(They are all included in “Application Glue & Automator” Bundle, “All Extensions” Bundle)