Taking Mobile Payments in your business with Sum Up (In App Walkthrough - Payment links, Invoicing)

The many uses of pay by link

Stripe Payment Links Simple Links to Accept Payments

Get Paid Faster With Payment Links

Pay Invoices with Square Square Support Center - US

Online and Mobile Payments Lightspeed S-Series Support

Add Payment Method to Your PayPal Account

Business owners: getting paid is finally easier

Send invoices and request payments - and see what you've already requested - untied know how

Best practices for adding mobile payments to your app