### How this function works This function will allow you to add a new contact with the user email to a SendGrid contact list when a new user signs up. ### Requirements * You must have previous knowledge of **SendGrid**. ### Function details This function listens when a new user signs up and checks if an email is available according to the provider used to register. If an email is available, it will add a new contact with that email to the specified SendGrid contact list. To install this function you need to enter the values of the following variables: * **SENDGRID_API_KEY**: The API key to authenticate access to SendGrid services. * **SENDGRID_LIST_ID**: The ID of the list to add the contact. ### Resources * [SendGrid contact API](https://sendgrid.api-docs.io/v3.0/contacts/add-or-update-a-contact)