PayPal Checkout From Personal ACC

Hello

I have made a store on opencart 2.1 and I want to make a Paypal express checkout or some PayPal checkout.
I have installed extension for PayPal express checkout but in order this extension to work I need to give API.
I searched for it everywhere on my PayPal account it is Personal Account and i can't find it i don't even know if it exist for personal account.
Before i had BIGCARTEL and i was able to add my personal PayPal account for checkout is there is some way that i can do this with opencart?
inb4 I'm a shoe collector and i want to sell some of my collection online.

Thanks in advance