Extract ELN data using API

Hi Biovia Community,
Greetings !!
I am working to create a analytical platform (web portal for Analysis) for which I want to extract data from ELNs. 
Is there any API available which I can use ? 
Or Any possible way in which I can directly dump the data from ELN to Amazon S3 Bucket (or any Cloud Storage). 
What are my options to achieve this integration and sync data at scheduled intervals ? 
Thanks,
Vijay