Sumada Kaabaha: receipt
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Visit Notifications
Quickly receive email notifications when a visitor looks at a page or a quick summary of who visited a page.
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WP Stripe Email Receipts
WP Stripe Email Receipts is an add-on for the WP Stripe plugin, which sends an email receipt to the user after a successful Stripe transaction.
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Fakturo
The best and more complete open source Invoice System. An easy and fully-configurable SME Management system for Wordpress.