A good name is strengthened by the ordinary transaction handled fairly.

Reputation is not built at the dramatic moments, where everyone is watching and behaving. It accumulates in the small transactions nobody would ever have checked: the refund given without argument, the extra hour not billed, the honest answer about whether you are the right person. Each is minor and forgettable, and together they are what people mean when they say someone is straight with you.

Take the next small dealing you would be entitled to win and be fair instead. Return the thing, correct the invoice, mention the flaw before they find it. What you lose is small, and what you build is the reputation that survives contact with reality.