How to build a webservice called from CRM Online

Hi,

I am planning to write an ASP.NET WebAPI Service, that will be called from CRM Online and will generate a large amount of Appointments into the system.

Would I be able to call the webservice from a sandbox plugin, given its limitations,

or should I search for another option (maybe a button with JavaScript to call the service)?

What would you suggest as the best approach in this case?

And if the ASP.NET WebAPI service is not the best idea, what other service should I use?

Thanks.

Best regards,

Evgeni Dyulgerov