How it works
It is built from nine fields, each with its own weight: approval 22 · GTIN 16 · photo 14 · title and description 14 · category 12 · brand 8 · price 8 · availability 4 · condition 2. For every field we take the share of products that have it filled in, multiply it by the weight, add everything up — and convert the result into a letter from A to F.
A field whose data did not arrive does not quietly drag the score down: it is set aside and left out of the calculation.