Direct answer
Chargeback Evidence for Service Work
Dated delivery records and a client acceptance record are the evidence processors ask for in a service chargeback. A processor deciding a dispute wants to see what was agreed, what was delivered and when, and evidence the client received it and accepted it. If those records were created as the work happened, the packet assembles in minutes. If they have to be reconstructed under deadline, the dispute usually turns on whose story reads better, and that is a bad place to be.
Updated October 20, 2026.
What processors look for
A service chargeback usually claims the work was never received, was not as described, or was cancelled. The evidence that answers those claims is specific:
- The agreement: what was promised, for what price, on what schedule.
- Delivery, dated: records showing the work was delivered, with dates that stand on their own rather than on your say so.
- Acceptance: a record of the client receiving the work and accepting it, or using it, after delivery.
- Communication: messages showing the client engaged with the delivered work, asked for changes, or confirmed receipt.
Screenshots of a chat thread help, but they are easy to dispute. Records created at the moment of delivery, with dates a third party can check, carry more weight because they were not made for the dispute.
Assemble the packet
- Start with the dispute notice. Note the reason code and the response deadline; the packet answers that specific claim, not every possible claim.
- Add the agreement. The proposal, contract, or order confirmation that defines the work.
- Add dated delivery records. One record per deliverable, each showing what was delivered and when.
- Add the acceptance record. The client's acceptance of the handover, dated, is the single strongest item for a service dispute.
- Add supporting messages. Only the ones that show receipt, use, or requested changes after delivery.
- Write a short cover note. One page that maps each item to the claim it answers, in order.
Using receipts and the handover acceptance record
When work runs through Zambo's MCP, each step leaves a verifiable receipt at the moment it runs: the tool, the saved result, and the date, on a public page anyone can check at zambo.dev/verify. A receipt proves the saved result was not changed after the fact, which is exactly the question a delivery record has to survive. Deliver the job as a handover: one link carries the whole job, the client opens it and accepts or flags it, and that acceptance is itself a dated record. In a dispute, the packet is then simple: the agreement, the handover link with its step receipts, and the dated acceptance at the end of it.
For $0.99, a Day Pass covers 24 hours of full use. Ongoing use is the Zambo Pass at $29 a month or $290 a year, and $19 a month for $ZAMBO holders. Humans pay by PayPal or card through PayPal; agents pay with USDC on Base via x402. A Day Pass covers a day of recorded delivery work, which is enough to put your next client job on the record before there is any dispute to answer.
The timeline to work to
- Before the job: agree the work in writing and deliver through a handover link from day one, so records exist before anyone needs them.
- At delivery: get the acceptance while the work is fresh. An acceptance recorded at delivery is worth more than any explanation written later.
- When a dispute lands: you typically have days, not weeks, to respond, and the deadline on the notice controls. Assemble from records, do not reconstruct from memory.
- After responding: keep the packet and the underlying records unchanged. Editing a record after submitting it undermines the whole packet.
Honest limits
No evidence packet decides a dispute by itself: the processor weighs both sides and its decision is final for that chargeback. Records help because they are dated and checkable, not because they force an outcome. A receipt proves the saved result was not changed after the fact; it does not prove the work met the client's quality expectations, which is why the acceptance record matters alongside it. This page is practical guidance, not legal or financial advice.
Frequently asked questions
What evidence wins a chargeback for services?
The strongest packet for a service chargeback combines the written agreement, dated delivery records for each deliverable, and a dated client acceptance record, supported by messages showing the client received and used the work. Processors decide on documents, so records created when the work happened carry more weight than explanations written after the dispute arrives.
What counts as proof of delivery for a service?
Proof of delivery for a service is a dated record tying the deliverable to the client: what was delivered, when, and evidence the client received it. A handover link the client opened and accepted is a clear example, because the delivery steps and the acceptance are each recorded with dates that a third party can check.
How do Zambo receipts help in a chargeback?
Each Zambo tool call leaves a verifiable receipt at the moment it runs, published on a page the processor can open and check at zambo.dev/verify. The receipt proves the saved result was not changed after the fact, so the delivery record in your packet is the record made at delivery, not a file assembled for the dispute.
Does a client acceptance record prevent chargebacks?
No. A client can still file a chargeback after accepting work, and the processor still decides the outcome. What the acceptance record changes is the evidence balance: the dispute is no longer your word against theirs, because a dated acceptance of the delivered job sits in the packet.
How long do I have to respond to a chargeback?
The deadline is printed on the dispute notice from your processor and it controls, so work to that date rather than a general rule. Response windows are often measured in days. Jobs delivered with records already in place can be answered the same day the notice arrives, which is the real advantage of keeping the packet ready before any dispute exists.