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EnvironmentVariable types can have either of the following structures:

"key": {
    "secret": "value" <-- secret environment variable
  },
  "key": "value" <-- plaintext environment variable

Here is a good example in the Deployments REST API payload: https://www.pulumi.com/docs/pulumi-cloud/deployments/api/#examples-1

{
  "preRunCommands": [
    "go get <http://sigs.k8s.io/kind@v0.16.0|sigs.k8s.io/kind@v0.16.0>"
  ],
  "environmentVariables": {
    "AWS_REGION": "us-east-2",
    "CUSTOM_VARIABLE": "foo",
    "MY_PASSWORD": {
      "secret": "my-secret-password"
    }
  }
}

I'll give it a try now! Thanks!

Great, glad to hear it!