Added billing subscription APIs in new 2021-10-01 version

[jbuls]

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[openapi-workflow-bot]

Hi @jbuls, one or multiple breaking change(s) is detected in your PR. Please check out the breaking change(s), and provide business justification in the PR comment and @ PR assignee why you must have these change(s), and how external customer impact can be mitigated. Please ensure to follow breaking change policy to request breaking change review and approval before proceeding swagger PR review.
Action: To initiate an evaluation of the breaking change, create a new intake using the template for breaking changes. Addition details on the process and office hours are on the Breaking change Wiki.
If you want to know the production traffic statistic, please see ARM Traffic statistic.
If you think it is false positive breaking change, please provide the reasons in the PR comment, report to Swagger Tooling Team via https://aka.ms/swaggerfeedback.

[j5lim]

Discussed offline. Approving from ARM side.

[jbuls]

Hi @jbuls, one or multiple breaking change(s) is detected in your PR. Please check out the breaking change(s), and provide business justification in the PR comment and @ PR assignee why you must have these change(s), and how external customer impact can be mitigated. Please ensure to follow breaking change policy to request breaking change review and approval before proceeding swagger PR review. Action: To initiate an evaluation of the breaking change, create a new intake using the template for breaking changes. Addition details on the process and office hours are on the Breaking change Wiki. If you want to know the production traffic statistic, please see ARM Traffic statistic. If you think it is false positive breaking change, please provide the reasons in the PR comment, report to Swagger Tooling Team via https://aka.ms/swaggerfeedback.

@akning-ms Version 2021-10-01 has not been released yet. It was added recently for the payment APIs, and this update adds Billing Subscription APIs to provide a unified management experience for all types of commerce purchases, including support for Microsoft 365.