kala

You wouldn't need someone familiar with blesta functions to create the API. Just someone that is familiar creating API's. I use freelancer.com for work that I hire out.

You would need to develop this functionality into blesta, or create your own API. Currently the blesta api offers full access to all functions of blesta so your customer would have access to everything, including other customers data. Administrators do not have have granular controls on what access API users have at the endpoints, and probably never will due to the way the blesta api works.

Thanks for your suggestion. We have had a talk in our team and we finally implemented it in a different way which is suitable for our envs. Thanks again for your help

Same problem here....we have been scratching our head to get a clean solution without enforcing our own patch! 

That's great news. I have updated the docs for recommended requirements, and also the support manager to mention iconv. I wonder if iconv was previously included in most PHP builds by default, it only recently seems to have become an issue. Either way, good to know and glad you're up and running!  

Paul, you are my hero. I followed your instructions and here is the test result.
So it says missing 'iconv' PHP module and installing the module into my PHP fixed the issue. I have checked the requirements doc, where I could not find this module dependency! So if I didn't miss related reference, please update the documentation and include this module also; may be helpful for someone else in future.
 
Thanks again for your help Paul. Thanks for your time to check Mike