It looks like you did have quite a few different cases to deal with, then, as well as the migration from an existing system? If so, that's pretty much what I me

It looks like you did have quite a few different cases to deal with, then, as well as the migration from an existing system? If so, that's pretty much what I meant by "relatively complicated requirements" and I assume would explain the difference in time and code volume compared to the greenfield implementation we did. I imagine most early start-ups would have less challenging requirements than yours for any payment platform integration, though.