I have received the following from Worldpay, can anyone tell me if it will be a problem? Out of courtesy, I wanted to provide you with some information on an event that will occur within the next two or three weeks. Every successful transaction you process through WorldPay generates a unique identification number, known as a 'transId'. Currently, a transId is 8-digits long, however these are about to roll-over and so will increase to 9-digits. This increase will have no impact on WorldPay's service to you, as our systems are designed to handle up to 16 digits (as documented in our integration guides). This increase will probably have no impact on your website's services. However, for peace of mind, I would suggest that if you use a Shopping cart or WorldPay's callback feature, then you should confirm whether this increase will affect your service. Unfortunately, as this increase in transId will only affect your systems, we are unable to analyse or diagnose the potential problems within your website's systems, or to provide you with advice on possible solutions.