需启用哪个Google API以使用InstanceId服务？批量映射APNS到FCM令牌疑问

Q1: Which Google API do I need to enable to use the Instance ID (IID) service? #

You’ll need to enable the Firebase Cloud Messaging API (sometimes labeled as Cloud Messaging API in older console views) in the Google Cloud Console. Instance ID is deeply integrated with FCM, so turning on this API unlocks all IID-related functionality—including token generation, management, and batch operations like the one you’re working with.

Q2: Why can’t I find the Instance ID service when using batchImport to map APNS tokens to FCM tokens? #

This is a super common gotcha! The standalone "Instance ID" service no longer exists as a separate entry in the API library. Here’s what you need to know:

• The https://iid.googleapis.com/iid/v1/ endpoints are part of the Firebase Cloud Messaging API ecosystem. You don’t need to hunt for a separate IID service—just enable the FCM API (as covered in Q1) and you’ll have full access to these endpoints.
• When sending your batchImport request, make sure you’re authenticating with a valid service account key that has the right permissions (typically firebase.messaging permissions) for your Firebase project.
• If you’re navigating the Google Cloud Console, search for "Firebase Cloud Messaging API" in the API Library, enable it, and you’ll be able to call the batch import endpoint without any issues.

Quick tip: Double-check that your service account is linked to the correct Firebase project and that you’re using the proper credentials (either an API key or service account JWT) in your request headers.

内容的提问来源于stack exchange，提问作者Zambosi