ProjectId is used to check subscription against your project. If you do not provide any projectId then editor will consider it as free plan by default. For this, please follow the mentioned below steps:
1. Click on your project and expand the Embed section. Then click settings and you will see your projectID in Site Code. See example below:
2. Copy the projectId and add in your initialization code when you are embedding Unlayer editor in your application. See example below:
