A method and apparatus are disclosed for improving system performance by controlling the flow of transactions between interconnected nodes by considering the system resources required for a transaction response when determining whether to send a transaction. In various embodiments, the data may be collected using a wide variety of data collection technologies and may be used in conjunction with stored data, including data collected from other merchants, by a return authorization system to make a determination whether to accept or deny the requested merchandise return. The end effector is configured for insertion into a lumen to deliver a tissue repair composition into that lumen. Furthermore, the database can be easily updated to correspond with changes in the laws andor regulations applicable to a particular site, or to correspond with changes to the devices, systems or environmental elements located at a particular site.