How to proactively push messages to a known user openid?

How can a known user openid proactively push messages to this user?

The openid of a user is known, and the user has followed the official account. How to proactively push messages to this user?

1. Just send a customer service message.

2. Just send a customer service message. However, there are restrictions. Please refer to WeChat’s developer documentation:

When a user interacts with a public account with a specific action (see the description below for the specific action list), WeChat will push the message data to the developer, and the developer can Within the time (currently modified to 48 hours), call the customer service interface and send a message to ordinary users by POSTing a JSON data packet.

If there is another way to send messages directly without user interaction please @ me. I also want to know.

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