Additional explanation: It may not have been described clearly. What I want to obtain is the customer ID information in the extended detailed information. Is there a suitable API or method
Obtain Custom ID information through the interfaceAnswered
When creating an extension code, the Custom ID was set. After the C++product application extends the trial period with the extension code, the C++product program checks the trial period to see if there is any way to obtain the Custom ID through the interface？
Answer
Yes, covered extensively in the custom license fields article: https://wyday.com/limelm/help/license-features/
You collect the customer information. You set it when you generate the key (using custom license fields), and then you can retrieve it in your app (again, using custom license fields).