What happens if the project scope changes halfway through?

It usually does, a little, and that’s normal rather than a sign the planning was bad. Small adjustments — swapping one integration for a similar one, tweaking a workflow once you see it running — we typically absorb without a formal change order if the effort roughly nets out. Anything that meaningfully adds work, like a new feature, a new integration, or an “actually we also need it to do this” request, gets scoped and quoted as a change order before we build it, so you’re deciding with real numbers instead of finding a surprise on the final invoice.

What we try hard to avoid is silent scope creep in either direction: us quietly absorbing extra work and resenting it later, or you assuming something was included that never actually was. A short conversation and a written estimate before the work starts usually heads off both.