Server for running Paypal like payment processing service

I am currently writing a business plan regarding my e-commerce project, involving payment processing service like PayPal.

I would like to ask for your suggestions regarding the following issues:

1) What kind of Server will I need to purchase to run the service smoothly?

2) What kind of Bandwidth will I need?

I presume having not more than 5,000 members.



I appreciate all your help.

Thank you in advance.

 

 

 

 

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