Lead Form Process data from Google Ads Lead Form Extensions

action.js

/*
{"lead_id":"TeSter-123-ABCDEFGHIJKLMNOPQRSTUVWXYZ-abcdefghijklmnopqrstuvwxyz-0123456789-AaBbCcDdEeFfGgHhIiJjKkLl",
 "user_column_data":[{"column_name":"Full Name","string_value":"FirstName LastName","column_id":"FULL_NAME"},
                     {"column_name":"User Phone","string_value":"+16505550123","column_id":"PHONE_NUMBER"},
                     {"column_name":"User Email","string_value":"test@example.com","column_id":"EMAIL"},
                     {"column_name":"Company Name","string_value":"CompanyName","column_id":"COMPANY_NAME"}],
  "api_version":"1.0","form_id":40000000000,"campaign_id":281489216452814,
  "google_key":"----","is_test":true,
  "gcl_id":"TeSter-123-ABCDEFGHIJKLMNOPQRSTUVWXYZ-abcdefghijklmnopqrstuvwxyz-0123456789-AaBbCcDdEeFfGgHhIiJjKkLl",
  "adgroup_id":20000000000,"creative_id":30000000000}
  
  see: https://support.google.com/google-ads/answer/10089407?hl=en
*/
exports.handler = function(event, context, callback) {
   const data = JSON.parse(decodeURIComponent(event.options.request_body));
   const gclid = data.lead_id;
   const campaign_id = data.campaign_id;
   const adgroup_id = data.adgroup_id;
   const creative_id = data.creative_id;
   
   const formData = {};
   const customFields = {};
   const fieldMapping = {
      'FULL_NAME': 'caller_name',
      'PHONE_NUMBER': 'phone_number',
      'EMAIL': 'email'
   };
   
   data.user_column_data.forEach( (field) => {
     const ctmFieldName = fieldMapping[field.column_id];
     if (ctmFieldName) {
       formData[ctmFieldName] = field.string_value;
     } else {
       customFields[field.column_id.toLowerCase()] = field.string_value;
     }
   });
   formData.paid_attribution = {
     gclid: data.gcl_id,
     adgroup_id: data.adgroup_id,
     campaign_id: data.campaign_id,
     creative_id: data.creative_id,
     form_id: data.form_id
   };
   if (Object.keys(customFields).length) {
     formData.custom_fields = customFields;
   }
   console.log(formData);
   context.done(null, formData);
}