WP-Invoice – Web Invoice and Billing

Customers need way to download and save invoices and single page checkout allows you to do online commerce.
The basic allows you to send out the bill.
What I also like is that I can set it up to be HIPAA compliant and still use PayPal.
I have designed the process to send just amounts to paypal while leaving out the information.
So if your are ok with some PHP it's easy to customize WP-Invoice to your needs.
What I do not like I wish the documentation was more complete.
I have had to dig to get clarification on parameters and how to use them.
So from developers perspective, I have had to dig through the code to try to figure out what in the world this or that parameter is supposed to do.
I have emailed them with questions, 80% of the I get ok response 20% of the time they ask if I want to purchase time from them.
Once I have to open every open account and tell each one to set up notice and then send them all individually.
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