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Sorry to say but I am not exactly clear on what it is that you are asking. If my assumptions are correct, you would like to know how you can route forms users to LDAP for approval or authentication?
If this is the case, I checked both our widget and app directories and I am unable to locate any addon or feature to support your request. You can review our Jotform API site to see if there is anything that can be of any assistance in this situation. In addition, feel free to spare some more details on what exactly it is you would like to achieve so we can escalate it to our developers for assessment. I am looking forward to your response. I hope to hear from you soon.