Deployment Admin Client.
curl \
-H "Authorization: Bearer $ACCESS_TOKEN" \
/subscriptions/{subscriptionId}/providers/Microsoft.Deployment.Admin/locations/global/productPackages/{productId}/secretscurl \
-H "Authorization: Bearer $ACCESS_TOKEN" \
/subscriptions/{subscriptionId}/providers/Microsoft.Deployment.Admin/locations/global/productSecrets/{productId}/secrets/{secretName}