Get parameters are written to the database (encoded by base64)

Question

GET /api.php?token=eyJ1Ijoi5p2O5YW1IiwiaWQiOiIwMDIxOTMifQ==

{"u":"Name","id":"Student ID"}

I copied it directly from the front end. How should I write it in the back? It’s urgent. I can give you a red envelope.