- Post：
- 20/01/2020
- Last Update：
- 29/07/2020
- Best answer
You can use API method Get follower IDs it will get the userId of users who have added the LINE official account as a friend (followers). Note: This feature is available only to verified or premium accounts. see more information by link below https://developers.line.biz/en/reference/messaging-api/#get-follower-ids
- Post：
- 16/01/2020
- Last Update：
- 20/01/2020
unfortunately, It is difficult. you can save userId only when receive webhook events. (ex. follow, message