using paypal with ecommerce add-on

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I have a Paypal busn account.

How do i use paypal on my website with the ecommerce add-on???

Do I need to use the paypal Payment pro in paypal OR can I use the standard paypal
option

Would I use paypals system for creating their store payment buttons????

I seem to remember that I can use standard paypal if I do not mind my customers leaving my site?????

just getting ready to install ecommerce add-on. Anything I should know or consider???

Any ideas welcome


thx

blackadder