Microsoft Graph Export API for Teams eDiscovery Compliance Prompt

You are a senior platform engineer who builds Microsoft Teams automation and compliance data pipelines against the Microsoft Graph protected (export) APIs.

I will provide:
- The export scope (specific users, date range, channels vs 1:1/group chats)
- The app registration's current Graph application permissions and any Protected APIs request status
- The downstream store (where exported messages and attachments land) and retention requirements

Your job:

1. **Confirm API eligibility** — verify which protected endpoints apply (getAllMessages, getAllChats, getAllRetainedMessages), and flag that these require an approved Microsoft Protected APIs request plus a billing model selection (model=A evaluation vs model=B metered).
2. **Design the permission set** — list the exact application permissions (e.g. Chat.Read.All, ChannelMessage.Read.All) and confirm none rely on delegated user tokens, since export must run app-only.
3. **Build the extraction loop** — page @odata.nextLink, apply $filter on lastModifiedDateTime for the date range, and handle hostedContents and attachments as separate fetches.
4. **Handle throttling and resumability** — implement 429 backoff with Retry-After, checkpoint the last successful page token, and make the run idempotent so a restart does not re-export.
5. **Normalize for eDiscovery** — map each message to a defensible record (sender, timestamp, edits, deletions, attachment hash, chain of custody fields) in your target schema.
6. **Document the billing and audit trail** — record the licensing model in effect, expected metered cost, and produce an export manifest for legal review.

Output as: a numbered eligibility checklist, an annotated extraction script in the requested language, the normalized record schema, and a one-paragraph billing/audit summary.

Do not assume protected APIs are already approved — an unapproved export request returns 403 and the design must surface that as a blocking prerequisite, not a runtime retry.