Hi, Ionut.

Thanks for reaching out to us.

In terms of providing the data source, i am afraid that we are not able to help you with that.

Our support can only advise you how you can use your data source to make tables with our Plugin.

I will give you some examples.

If you link the table to a JSON file, this file has to have structure as we pointed out on this documentation. I will copy the important part here :

 Currently, wpDataTables accepts this, and only this format of JSON (see example on the docs page): 

a one-level array of same-structured objects where each object will be parsed as a row, and each field inside of the object as a cell.

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 If your software does not return this format, you would need to prepare, for example, some PHP adapter to return one of the formats that wpDataTables would accept.

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2. If your JSON file has multiple levels, then you will have to try our NESTED JSON method.

3. If you wish to use API, and to pull data from it,  then you will have to adapt it to PHP Array, and make a table linked to PHP Array.

And i just wanted to point out that you can try wpDataTables before purchasing

 on our sandbox Demo sites ( you can find links for the main plugin Demo,  

as well as add-on Demos, in my signature),

and there is a 15-day money-back guarantee period, 

so if you purchase the plugin, you can safely fully test it out, and if it doesn't fit your needs you can request and receive a refund in that period. ( same goes for all plugins and add-ons)

Let me know if you have any additional questions.