Update documentation/API-Testing-Guidelines.md

Co-authored-by: Pedro Díez García <pedro.diezgarcia@telefonica.com>

documentation/API-Testing-Guidelines.md

@@ -71,7 +71,7 @@ For operation with implicit subscriptions:
 
 For the explicit subscriptions model:
 
-* Validate that the subscribed events are received in the `notificationUrl`, with the right `notificationAuthToken`, for those situations specified in the API.
+* Validate that the subscribed events are received in the `sink`, with the right `sinkCredential`, for those situations specified in the API.
 * For subscriptions that provide `subscriptionExpireTime`, validate that the subscribed events are not longer received after the expiration time.
 * For subscriptions that provide `subscriptionMaxEvents`, validate that the subscribed events are not longer received after the maximum events limit is reached..
 * Validate that after a subscription is deleted, the subscribed events are not longer received.