Best mobile credit card processors of 2020: credit card readers for offline payments
By Tech Radar
SumUp
"A cost-effective mobile card reader"
PayPal
"The mobile card reader from the online transaction juggernaut"
QuickBooks GoPayment
"The small business accounting software mobile card reader"
Shopify
"Taking your business anywhere"
iZettle
"The iZettle 2 card reading system offers freedom and flexibility"