Why aren't some Facebook conversions tracked using PayPal?

Question

Facebook

There is a site on Angular 1.5 and the main traffic comes from Facebook ads. Payment is made on the paypal site (that is, the transition to the paypal site, then a redirect to the thank you page) on which the purchase pixel is already located (100% works). And some of the conversions are lost. Before that, the payment was without going to a third-party site and everything was ok. Has anyone encountered this problem using PayPal? If yes, how was it solved?

Answer 1

CLICK for payment in a new window - here it’s not 100%
that only the merchant decides for you,
but use internal methods by transaction ID