Common source records
Contracts, purchase orders, invoices, delivery evidence, approvals, messages, statements and payment records may all matter depending on the case.
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Evidence guidance
Keep the source material that explains the debt.
Useful evidence normally explains what was agreed, what was delivered, what became due and how both sides responded. Keep originals and context; do not edit source material to make it look stronger.
Quality over volume
A smaller coherent set can be more useful than repeated screenshots or unrelated files. The customer remains responsible for relevance and lawful use.