Card-issuer chargebacks and small-claims disputes usually come down to one thing: whether you can show, in order, that the work was agreed to, delivered, and accepted before the client stopped paying. Scattered emails and texts make that case badly. A single document with the invoice, a clear timeline, and your notes makes it easy for a payment processor, a judge, or a collections agency to see exactly what happened. This doesn't file anything on your behalf or guarantee an outcome, it just gives you a clean piece of evidence to submit.