Explanation:

To create a single multi-service Cognitive Services resource (now Azure AI Services) that provides one key
/endpoint for multiple services , consolidates billing, and allows adding services like Text Analytics (sentiment analysis) and Computer Vision (OCR) from the same resource, you must:
Use the Azure Resource Manager (ARM) REST API with PUT to create or update the account:
PUT /subscriptions/{subId}/resourceGroups/{rg}/providers/Microsoft.CognitiveServices/accounts/{name}?
api-version=2017-04-18
Set " kind " : " CognitiveServices " to create the multi-service account (not a single-service kind like ComputerVision or TextAnalytics).
This satisfies the requirements: single key/endpoint, consolidated billing, and future Computer Vision use.
Microsoft Azure AI Solution References
ARM REST for Cognitive Services accounts (create/update via PUT , multi-service " kind " : " CognitiveServices " ).
https://learn.microsoft.com/azure/ai-services/management/resource-manager-create-account Azure AI Services multi-service resource (single endpoint/key across services).
https://learn.microsoft.com/azure/ai-services/multi-service-resource