There is a question. If paid ad placement is enabled, then after payment, the ad immediately becomes visible on the site bypassing the moderation plugin. How do I make sure that even after paying for the placement, the ad should still pass moderation before publication?

Not quite sure how moderation plugin works, maybe you need to improve conditions there.

The moderation plugin "Item Validation Plugin" is working properly. The only problem is that if the payment for placement function is activated in Osclass Pay and the user has paid for its placement by placing an ad, then the ad is automatically published on the site bypassing moderation.

@atba
I think in this case there could be conflict between 2 functions in hook.
Would require bit more investigation.