Use this procedure:
To create and update customer contact points. See: Creating and Updating Customer Contact Points.
To create and update contact points for account contacts. See: Creating and Updating Contact Points for Account Contacts.
To create and update account site contact points. See: Creating and Updating Account Site Contact Points.
To create and update Creating and Updating Contact Points for Account Site Contacts. See: Creating and Updating Contact Points for Account Site Contacts.