In writing, before the extra work happens. 'While you're here, hit that fence line too' is a new scope with a new price — quote it on the spot, get an approval (a timestamped e-sign from the customer's phone takes a minute), and add it to the invoice. The operator who does handshake extras eats them at invoice time.
Mastiff is the one app for forestry mulching and land clearing companies — jobs, density-based quoting, invoicing, equipment, before/after showcases, and directory leads in one login.