Stock-outs cost more than the sales you missed
The lost revenue during a stock-out is the small part of the bill. The expensive part is what happens to your ranking afterwards.

Nobody sets out to break a catalogue. It happens through ordinary activity: a category adds a required attribute, a supplier changes a pack size, an image gets replaced with one that fails guidelines, a variation is added without being mapped to its parent. Each change is individually reasonable. Collectively they produce a catalogue where a meaningful share of your range is quietly unbuyable.
The reason this is expensive is that a suppressed listing does not just stop selling. It loses its ranking position — and ranking is far harder to regain than it was to lose.
The routine below takes under an hour for most catalogues once it is set up, and it is the single highest-return operational habit we know of.
The difference between sellers who suffer from listing decay and those who do not is almost never tooling. It is whether the check happens on a fixed day regardless of whether anyone suspects a problem.
Run it weekly, log what you found, and after two months you will have a clear picture of which failure modes your catalogue is actually prone to — which is the point where automating it starts paying off.
The lost revenue during a stock-out is the small part of the bill. The expensive part is what happens to your ranking afterwards.
Including the ones we would rather you did not ask us. If a provider cannot answer these plainly, that is your answer.
Book a free consultation and we will review your setup, then tell you honestly what is worth fixing first.