When you publish APIs through API Management, it’s easy and common to secure access to those APIs by using subscription keys. Developers who need to consume the published APIs must include a valid subscription key in HTTP requests when they make calls to those APIs. The API Management gateway rejects calls without a subscription key and the calls aren’t forwarded to the back-end services.
To get a subscription key for accessing APIs, a subscription is required. A subscription is essentially a named container for a pair of subscription keys. Developers who need to consume the published APIs can get subscriptions.
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