How to convert Base 64 format to document?

Certified Lead Developer

I am looking for a way to convert Base 64 format string to document in Appian. 

Note: The base 64 format string is coming as a JSON input request string when external system hits Appian web API. So, I don't have any integration object here to auto-convert the same to document using default Appian functionality in integration object. I need to receive this format, convert into document, store in Appian document folder and show the same in UI (without using integration).

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