With this project our implementation strategy was very important as it always is when we are updating an existing website rather than starting from scratch.
In these circumstances we clone the site over to our development area where we can safely make all the changes, test them and have the client sign off.
For this project when we were ready to go live we agreed a suitable “out of hours” window where we could make migrate the site to “live” followed by some live testing to ensure the integrations with the Clickbank payment gateway were still working.