Banks pay on documents, not on goods. This is the document.
Quality control issues a certificate, and under a letter of credit that certificate is what the payment runs against. The goods can be flawless and the payment still stops if the wording does not match what the credit asked for.
This is the stage where people find out what a letter of credit actually promises.
Not that your product is good. That your paperwork is right.
Why the credit lists documents at all
A bank paying under a credit has no way to verify a shipment. It cannot open a container and it will not send anyone to a factory. So the buyer and the bank agree in advance on a list of documents that will stand in for the goods, and the credit names them.
Every name on that list is a condition. Meet all of them and the bank must pay. Miss one and it need not.
What the certificate has to say
A quality certificate works or fails on the issuer, the standard and the description of the goods.
The issuer. If the credit names who must sign, only that party will do. An in-house laboratory is not an independent one, and the credit usually says which it wants.
The standard. A certificate has to state what the goods were tested against. A named specification, a tolerance, a version. Conformity to nothing in particular is not conformity.
The description. The goods on the certificate have to be recognisably the goods on the invoice and the credit. This is the same trap as Stage 6, arriving one document earlier.
The thing nobody explains
A bank checker is not deciding whether your product is good. They are comparing strings of text against a list, within a few banking days, without leaving the desk.
Once you accept that, the certificate stops being a technical document and becomes a formatting exercise. That sounds cynical and it is the most useful thing on this page: the fix is almost always in the wording rather than in the laboratory.
What we got wrong
Our first draft of this page told exporters to use a better laboratory.
That advice was wrong, and we withdrew it. In every refused presentation we had looked at, the testing had been done properly and the certificate still failed, because the wording did not line up with the credit. We had been treating a formatting failure as a quality failure, which is the exact mistake this page now exists to prevent.
The laboratory was never the problem. The template was.
What the full version will add
We are collecting refused presentations where the quality certificate was the stated reason, so that we can show which of the three failures above dominates in practice. Until we have enough of them to be honest about the pattern, this stage stays short rather than padded.
Open your current credit and find the clause listing the quality or analysis certificate.
Underline the issuer it names, the standard it names, and the goods description it uses. Then compare all three against the certificate your laboratory actually produces today.
Any of the three that does not match is a refusal waiting for the shipment to sail.
ICC, UCP 600 — documents are examined on their face against the terms of the credit.
Practice described here comes from presentations we have read and is marked as practice, not as published data.