PHP + PayPal - how to integrate/merge both?

i have an idea about how pay-pal works but not an expert.

I'm asked to implement online banking (using PHP) through PAY-PAL in my page.

I've no idea where to begin.

No introductory sites where found开发者_运维问答 by 'googling'.

• Is web-service needed for this implementation?
• Any site for beginners will do.

Thanx all.

check out this link

Read this section
Using Merchant Services
You will get basic info of