### How this function works This function will allow you to add a new contact to a HubSpot contacts list when a new user signs up. ### Requirements * You must have previous knowledge of **Firebase**. * You must have previous knowledge of **HubSpot**. ### Function details This function listens when a new user signs up and try to resolve the user contact according to the user record provided by Firebase Authentication.Then add this user record in the HubSpot contacts. To install this function you need to enter the value of the following variable: * **HUBSPOT_API_KEY**: The API key to authenticate access to HubSpot services. ### Resources * [HubSpot ApiKey](https://knowledge.hubspot.com/integrations/how-do-i-get-my-hubspot-api-key)