Pay-by-Link
Pay-by-Link from Paycent is a service that sends Internet hyperlinks in emails and other electronic documents for easy payment. It also uses QR-Code for payment with paper documents. For the use of payment links together with QuickBooks, we recommend the newest version of QEmail. You can send payment links with invoices and statements.

More information here

QEmail 2010
Easily email invoices, statements, sales receipts and other reports directly from QuickBooks to your customers and vendors. Stay in contact with all the people you are doing business with. Select email addresses from customers, vendors and employees. Apply various filters.
Create HTML emails and deliver those directly
or by our rapid delivery service.

Fact Sheet

Download from here.

QImport 2010
Import, modify and export transaction data and other items from various sources from/to QuickBooks. Most common actions are invoices, sales receipts and checks.
The new Version 4 includes SQL access, batch functionality.
Supports now practically all QuickBooks versions.

Read the Fact Sheet

Download from here.

Use SalesForce Data for Import

QMerchant 2010
Use this customized solution to process credit-card and electronic-check payments from QuickBooks via Authorize.Net, PayPal, and Others.
The payment requests are invoked directly from QuickBooks and transmitted to your payment provider. 
Supports most QuickBooks versions including QuickBooks - Point of Sale (POS) and QuickBooks Enterprise.
Learn How it works, read the QMerchant Guide,
visit the Fact Sheet or Download from here.
Also available as Virtual Terminal without using QuickBooks

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