The December 2015 Release contains the following enhancements:

• Ability to set a default billing contact. This is useful for accounts that you invoice on a regular basis.

• Payment rollup on Opportunity.

• More options when defining payment plans.

• When creating an invoice, contact being associated with the account is now optional. You can use a contact that is not under the account.

• Support for Card-Present transactions.

• Bug fixes.