CRM 2013 - QuickBooks Integration

Could you please send the QuickBook Pro 2013 integrate with CRM 2013 online?

1. How to retrieve/add the records like invoice,jobs and customers in the QuickBooks Pro 2013 using dotnet coding(Asp.Net with C# or C#?

2. How to integrate QuickBooks Pro 2013 to CRM 2013 Online instance (or) CRM 2013 Online instance to QuickBooks Pro 2013?