Hi there @danyarstoreku!
Don here from Shopify.
In order to take payments from your customers for their orders, you will need to have some sort of payment method in place.
The most usual way we see merchants operate is to have a credit card gateway in place in addition to a PayPal option and any other methods.
If you can let us know in which country your store is based, we can share a full list of the payment gateways available for use there.
Where you offer a version of PayPal to your customers to use instead of the credit card gateway, any orders paid that way would be paid out into your PayPal account as per your terms with them rather than being paid out by the credit card gateway provider.