Appian Data to be accessed by non-apian users

I have a requirement where a non-Appian user needs to access data in Appian system either through SAIL form or in any other way and provide his/her inputs against the each field of Appian data which I need to capture
back into Appian system. I have studied about Embedded Interface but as per my understanding it also requires to enter Appian credentials for accessing the Embedded Interface. Can anyone suggest me the best approach for achieving this requirement. Thanks in Advance

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