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You'll want to setup provider configuration, there's an example of that at https://github.com/pulumi/pulumi-go-provider/blob/main/examples/credentials/main.go

Thanks, I've found it and it works like a charm. At first there was an issue: If you're using it in a provider derived from the pulumi-provider-boilerplate you've got to implement "Version" and "pluginDownloadURL" in the Config as well. The python sdk complains about this missing properties, if I haven't implemented them. But after that it works great. 😉