Understanding the payment process and Shopify availability?

Payments + Shipping & Fulfilment
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1

  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 ?

2

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