TUTORIAL: Use APIs to Mail Invoices Programmatically [Rails]

Emailed invoices are easy to ignore. But a physical letter? Mailed invoices can earn higher response rates–especially for overdue payments. One brand study reported that the majority (59%) of its customers  failed to pay on first billing when emailed and needed additional reminders. Yikes. On the other hand, only 29% of those billed by direct …

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