hello world!
{"email_address":null,"status":"subscribed","merge_fields":{"FNAME":null,"LNAME":"","POSTCODE":null}}{"type":"https://mailchimp.com/developer/marketing/docs/errors/","title":"Invalid Resource","status":400,"detail":"The resource submitted could not be validated. For field-specific details, see the 'errors' array.","instance":"2b0f8f08-3d8f-d3b4-05f3-c568dfe54833","errors":[{"field":"email_address","message":"This value should not be blank."}]}400