I did not bother to purchase any of these extensions to see how they realized the ability to print before sending, but I was able to do it myself quite easily.
It seems that they do not have only an admin interface, but it turns out that there are numerous models that support the getPdf method.
- Creditmemo
- Invoice
- Shipment
- Packaging
The difference between calling getPdf on Invoice instead of Shipment is the lack of tracking information in the PDF file.
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