Deals from the site on laravel via RestAPI in Bitrix24

You need to import trigger deals from the site to the laravel in cloud beatrix24. They write that in this process it is desirable not to use web hooks. If you dont, explain why.

Site - aggregate4.me
The trigger to send the transaction to B24 is the first payment at will. That is, when publishing the card on the site - the deal in bitrix does not fly away. Only the one on which there was at least some payment flies away.
Also, in subsequent payments they should be reflected in B24 on the existing transaction.