Track the purchase of a specific product (stripe)

Hello Team and especially @Pro_Tanvee and @Timo_Kaluza

I have a problem that I can’t solve.
I would like to update my CRM when a client buy a specific product on stripe with a payment links.

I did find this this topic, but it’s still pretty vague for me. I understand the logic, but I can’t put it into practice.

Could you please help me in more detail?

Thank you in advance.

try like this.