From their site: Web Form Factory is an open source web form generator which automatically generates the necessary backend code to tie your form to a database.
The WFF SOAP API gives the same result as the zip file provided to WFF users who use the main interface. The API can return a string representation of the said zip package you can extend with your own content, zip it, and present it to the user of your web-application.
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So far, we don't have a record of any changes to this API