This addon uses the Action Hook system and runs during the daily cron job (at the beginning) that checks all clients with a credit balance and Unpaid invoices, and applies the credit to the Unpaid invoices from oldest to newest. Also runs when an Add Funds invoice is paid and does the same for the specific client.
No special server configuration needed.
It is $6.00 CAD monthly (or $60 CAD annually - essentially getting 12 months for the price of 10) with free support & updates for as long as your service is Active.
Download the zip file from our client area and follow the instructions in the INSTALL.txt file included.
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The best place to start if you need help with a specific product is to contact the developer. All WHMCS Marketplace developers have both a website and support URL listed.
Integrate your financial data stored in WHMCS into QuickBooks Online.