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I have tested extensively with the Linking API and no matter what I do when building a report using a BigQuery data source, it always defaults to having the data credentials with Viewer Credentials.

I have tested having the data source both embedded and reusable.  

I have tested defining the data source and not defining it like so:

https://datastudio.google.com/reporting/create?r.reportName=Franchisee%20Dashboard%20for%20A007
&c.reportId=xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
&ds.ds0.datasourceName=A007
&ds.ds0.connector=bigQuery
&ds.ds0.refreshFields=false
&ds.ds0.projectId=xxxxx
&ds.ds0.type=TABLE
&ds.ds0.datasetId=franchisees
&ds.ds0.tableId=A007
&ds.ds0.billingProjectId=xxxxx
&ds.ds0.isPartitioned=TRUE

and

https://datastudio.google.com/reporting/create?r.reportName=Franchisee%20Dashboard%20for%20A007
&c.reportId=xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
&ds.ds0.datasourceName=A007
&ds.ds0.refreshFields=false
&ds.ds0.projectId=xxxxx
&ds.ds0.type=TABLE
&ds.ds0.datasetId=franchisees
&ds.ds0.tableId=A007
&ds.ds0.billingProjectId=xxxxx
&ds.ds0.isPartitioned=TRUE



Problem you have encountered:

It will not set the data credentials to match what's in the template document which has the data credentials set to Owner's credentials


What you expected to happen:

I expect that changing the combination of data source type from embedded to reusable and defining the connector parameter to change the output according to what is in the docs at https://developers.google.com/looker-studio/integrate/linking-api#permissions


Steps to reproduce:

1. build a report.  
2. go to edit mode
3. hit manage added data sources
4. click edit on the data source
5. Click Data Credentials
6. They will be set to Viewer's credentials.


Other information (workarounds you have tried, documentation consulted, etc):
I read these docs several times through: https://developers.google.com/looker-studio/integrate/linking-api

Workarounds tried:
- I tried setting the data source's data credentials as Owner's credentials
- I tried setting the data source as embedded, have linking API URL with &ds.ds0.connector set
- I tried setting the data source as embedded, have linking API URL with &ds.ds0.connector NOT set
- I tried setting the data source as embedded, have linking API URL with &ds.ds0.connector set
- I tried setting the data source as reusable, have linking API URL with &ds.ds0.connector set
- I tried setting the data source as reusable, have linking API URL with &ds.ds0.connector NOT set