Paypal OA Test format for Java, Backend role

I have received the Online Assessment link for the Java, Backend role from PayPal. This isn't a typical DSA-based test. It has 4 sections:

1. Java (Advanced)
2. SpringBoot (Advanced)
3. REST API (Advanced)
4. DSA (Intermediate)

While I'm familiar with the 4th and 1st sections to some extent, I don't know what to expect in the 2nd and 3rd sections. Has anyone else received this kind of online assessment recently, or know about this format?