light my lights a bit here please (noob)

well i am a noob in this kind of bussiness and i need to ask you guys a couple of questions.

1) I will be a web host reseller and clients will be able to purchase plans form our site. I am ok with my host and with my billing software. But i never did understand the real time transaction processing. Authorize.net and staff like.

1) How is the transaction been made?

2) What else do i need to have apart from a site and a billing software in order to get my money from a secure online transaction?

3) what is a merchant account? is it expensive to have one?

help you in advance

 

 

 

 

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