MySQL Changes
MySQL Changes are automatic and update your data in MySQL for realtime uses.
When you upgrade your version of BigBusiness and it changes content, your MySQL is automatically updated to include new fields, new types, and, as always, new data.
Multi-Customer Matching
Multi-Customer Matching uses 2 Lookups to find one card for a customer with many.
Most customers with multiple Ship-To's have one Customer card and many Contacts. Some have multiple Customer cards, if they pay separately, but try to work similarly.
Select Multi-Customer in Advanced Settings and map both Customer Lookup and Ship-To Lookup (normally for Contact) and it will match one Customer by using both.