If you are setting up data connector integration on your own, it doesn't charge any cost. However, if you want assistance in setting up the integration from top to bottom, you may need to check with Adobe Consulting via Account Manager. They are the one who will help you with fee structure in detail...

The default expiry of access tokens is 24 hours. You can refresh an access token without prompting the user for permission again even if a user is not present. The refresh token, by default, expires in 2 weeks. https://www.adobe.io/authentication/auth-methods.html#!AdobeDocs/adobeio-auth/master/OAut...

Page URL classification is the best resolution for your use case. 

Classification consider the value uploaded for key value i.e. main report. So it is going to reject first two value and overwrite with the latest one. 

This will check for list of unique visitors which includes carts exists event during the visit

I have seen this behavior when we have installed multiple extensions in a browser like ad blocker etc. You can try disabling plug-in one by one and see it that helps.

To work with Analytics 2.0 APIs on the Adobe I/O Console, you need to have System Admin rights or developer permissions for your organization. For developer roles, you can refer to this help document: https://helpx.adobe.com/enterprise/using/manage-developers.html

Visit Depth will be increase in case of page view but not in custom link call. Please refer to example for getting more clarity on how visit depth is calculated https://marketing.adobe.com/resources/help/en_US/reference/hit-depth.html 

You can select either workspace or any workspace project as a Landing Page after login. If you open any project, you will find this option under project.  

When you upload Data Sources data, you are uploading the metrics that will be available in the report interface.For example, if you are uploading Call Center Revenue for products you sell on your site, you can have that Call Center Revenue in the same report as Online Revenue. However, you will not ...