Your merchant service center in QB automatically combines sales from all account you have, multiple mobile swipers for techs, keyed in sales on the computer.
gopayment is the way to go IMO, and I ran 100s of cards via square.
No you can not use the square device for gopayments, but I got my reader from intuit in less than a full work week.
The gopayment reader is faster than square, less errors.
Believe me, it is not because the device is dirty, I have 50 of the little white things.
The gopayment reader is larger, but still fits in my portable desk, but for dorks like you Brian is comes with a lanyard to hang around your neck with a quick release glasp.
I really liked square, but I'm in love with gopayment.
I can imagine a professional company not accepting credit cards with the options today.
I've been taking them for 17 years.