If you have specific questions about the Freelancer child theme, please note you can discuss this with the child theme developer directly in the "Comments" tab of the
product marketplace page (to clarify, it is not created by AppThemes). In terms of the HireBee theme functionality though, the theme itself includes support for PayPal adaptive payments:
For each agreed project you can hold the money until work ends (via PayPal Adaptive Payments). On completed projects, the money held in escrow minus any site commissions will be automatically transferred to the freelancer. On non completed projects, employers are automatically refunded.
. Thanks.