Understanding the payment process and Shopify availability?

[Zeshanzaidi]

1) Explain in details, the cash from customers hand to mine. Please don't refer any article, explain in simple words. 

2) Shopify payments available or not, what does it mean ? The availability depends upon your home address or where your business is located or both should be same ?

[Zeshanzaidi]

I mean the country of residence or the country of business (where your customers live.