1) Subscribe Cloud Accounting and Create New Company.
https://auth.autocountcloud.com/identity/account/register/accounting
2) Login to OneSales and click on New Company.
https://onesales.autocountcloud.com/
Select the Company Name to link with OneSales.
Check on Use Marketplace Solution and Post to AutoCount Accounting v2.x (OneSales Link Plugin).
3) Login in this book and go to Profile > Download Links to download AutoCount OneSales Link Plugin.
Login AutoCount Accounting 2.x, go to Tools > Plug-In Manager, to install the plug in.
Go to General Maintenance > Access Right Maintenance, to add Access Right for access function for this plug in.
4) At OneSales, go to Settings > General > API Keys to generate API key. Select OneSales Link and click on Create.
Copy the API key and fill in at AutoCount Accounting 2.x > OneSales Link > Setting.