In Azure API Management can i use the subscription-key as part of Request headers instead of Query string parameter?

Subscription key can be passed either in the header or in the URL query parameter. Header is checked first. Query parameter is checked only if the header is not present. Header name should be ocp-apim-subscription-key

As an Add-on to @vladvino post. This is configurable per API. It is available in the Setting pane of the API Settings in the Azure APIM Portal.