Apple Ads Platform API vs LinkedIn Marketing APIs

Apple Ads Platform API

Every response carries RateLimit-* headers and a 429 carries Retry-After, Apple maintains MIT client libraries in four languages, and read-only API roles exist. The API was first released in August 2026. No status page, SLA, published OpenAPI file, idempotency key or test account was found, and a person must create the credentials in the Apple Ads interface.

LinkedIn Marketing APIs

Monthly API versions are each supported for at least a year, with dated sunsets and a changelog, and a test ad account lets an agent create campaigns that are never served or billed. Access needs LinkedIn's approval and a member's OAuth consent, standard rate limits are not published, and no OpenAPI specification was found.

Apple Ads Platform API

1. Send Authorization: Bearer {access_token} and X-AP-Context: adAccountId={adAccountId} on every ad account call. Get the account id from GET /v1/acls
2. Request a new access token every 3,600 seconds from https://appleid.apple.com/auth/oauth2/token with scope searchadsorg. The signed client secret lasts at most 180 days
3. Read RateLimit-Remaining on each response. On a 429 wait the Retry-After seconds, then double the wait up to 16 seconds
4. List and filter with POST to a /query endpoint, not GET with query parameters. Deleted entities return only when a filter asks for them
5. On PUT send only the fields to change, and send the complete desired array for any array field. Create campaigns with "status": "PAUSED" before review

LinkedIn Marketing APIs

1. Send Linkedin-Version: YYYYMM and X-Restli-Protocol-Version: 2.0.0 on every call. A missing or sunset version returns an error (426 for a deprecated one)
2. Create one test ad account with "test": true and build there first. Its creatives are auto-rejected and never billed, and it returns no reporting data
3. Create campaigns as DRAFT or PAUSED and check servingStatuses before activating. Some validation is postponed until activation
4. Pass fields= on adAnalytics. Responses stop at 15,000 elements and the endpoint throttles at 45 million metric values per 5 minutes
5. On Development tier, map each ad account to the app in the Developer Portal. Edits are limited to five accounts