PayPal Invoicing

PayPal's invoicing offering is exceptionally easy to use and learn. I transitioned from another product to PayPal invoicing and was impressed with the robust features, customizable options and overall performance of the application.

There are some limitations around payment options and allowing multiple payments on a single invoice. You can make a deposit, but no features or functionality around milestone payments for example, which would be really nice.

Allows us to quickly monetize new offerings and new product variations
Many different charging and payment options available
Attractive fee structure
Easy to setup and manage
Appropriate for b2b transactions where aesthetics are less significant.

Somewhat Limited Customization - to create a buying experience that doesn't feel you're "inside" of paypal is not trivial (and now is easier to do with other offerings).
While the Paypal api has improved recently, it's still not as flexible as stripe, aws fps or aws devpay.

PayPal's invoicing feature is free, so that puts it ahead of most of the competition on the market. But it also offers a pretty simple system that doesn't mesh well with complex operations with lots of products on offer. Retyping invoice items quickly becomes tiresome.

There are no customization options, no backend to add frequently added items to your invoices. For example, selling candles online in 4oz, 8oz, 12 oz, get ready to add each item by hand instead of being able to select those values and customize as needed for that invoice.