Convert old paypal checkout to new "smart checkout", I'm a little lost

[MikePHP]

Hello,

I'm sorry if this is the wrong board.

I'm trying to start using the new checkout method of PayPal, but I'm not used to it and find it confusing and tricky.

This is the old code that I'm still using:

And this is how far I gotten with the new codes:

I'm sorry I posted it as images, but it wouldn't let me post the code without errors and removing important parts of the codes.

I could really use some help here 😞

Thanks in advance