Upload a first-party data audience to Microsoft Advertising (Bing Ads) via the Customer Match API

Steps

1. Authenticate via OAuth 2.0 using the Microsoft Advertising authorization endpoint and obtain an access token with the Bing Ads API scope
2. Call the Campaign Management API AddAudiences operation to create a CustomerList audience, specifying the name, scope (Customer or Account level), and membership duration in days
3. Retrieve the audience ID from the response, then prepare hashed contact data: normalize and SHA-256 hash email addresses and phone numbers following Microsoft's specification
4. Call the Campaign Management API ApplyCustomerListItems operation, passing the audience ID and a list of CustomerListUserData objects containing hashed emails or phone numbers in batches of up to 1,000 records
5. Poll the GetCustomerListUploadStatus operation (or check the audience status in the UI) until the upload processing is complete and the audience size estimate is populated
6. Target the audience by adding an AudienceCriterion to an ad group or campaign using AddAdGroupCriterions or AddCampaignCriterions, setting the audienceId and bidAdjustment