Python function correction - Firebase <-> Mailchimp

We get a contact into Firebase Firestore when we fill out a form in Webflow. This feature works flawlessly. Then Firebase Functions convert_form_submission_to_user creates a Firebase Authentication username and sends the contact to Mailchimp, and updates Mailchimp Merge Fields. The contact in Mailchimp is identified by email address. Finally, Function sends Mailchim APi Trigger. There is no mechanism to check the timestamp when a Firestore record was added or modified. The problems we have are as follows: The problem is that for some reason the mailchimp merge field "NAME" update is not working. This field should contain the name of the last form the user filled out. Currently, it is the case that the name of the first form filled out is saved, but when the user enters the same email in another form, unfortunately the merge field "NAME" no longer updates. Other merge fields work ok. Mailchimp does not allow sending an email if the user enters the same email address in less than 5 min [login to view URL] Therefore, we would need to stop sending to Mailchimp if a record falls into Firebase Firestore in less than 5 minutes and only do it after 5 minutes. Queuing would probably be needed here. We would like the solution to use native Firebase features so that we are not exposed to high feature costs. We also have a problem such that in 1/3 of cases Mailchimp API Trigger starts too early. The merge fields data has not yet had time to save in mailchimp, and this trigger has already been triggered. Maybe it would be worth adding a delay of 10 seconds here? Or some other solution. We also have such an edge case. If a contact with the same email address but a different phone number drops into Firestore, the contact is not saved in mailchimp. Could we overwrite the new phone number instead? We also have a problem such that if the user enters a country prefix then the phone number is not saved in Mailchimp because the script overwrites it with the +48 prefix. We would like the +48 prefix to be overwritten, only if the user has not entered any country prefix. We would also like to add new merge fields: amount - AMOUNT, street - STREET, country - COUNTRY, not_exceeds - AMOUNT. After a record falls into Firestore, I would like these new records to update in mailchimp as well. The last thing is the test environment. I created a new project in Webflow, successfully linked it to a new separate project in Firebase and created a new mailchimp test account. I also pasted this feature code into Google Cloud, unfortunately it doesn't work. I am just a humble UX Designer stuck out tongue emoji