> Before you make any changes at all write as many end-to-end and integration tests as you can. ^ Yes and no. That might take forever and the company might be

> Before you make any changes at all write as many end-to-end and integration tests as you can. ^ Yes and no. That might take forever and the company might be struggling with cash. I would instead consider adding a metrics dashboard. Basically - find the key points: payments sent, payments cleared, new user, returning user, store opened, etc. THIS isn't as good as a nice integration suite - but if a client is hard on cash and needs help - this can be setup in hours. With this setup - after adding/editing code you can calm investors/ceos'. Alternatively, if it's a larger corp it will be time strapped - then push for the same thing :)