Hello @shijuc94592906
The API still exists. Please try adding the dependency in your pom.xml and try
<dependency>
<artifactId>cq-dam-entitlement</artifactId>
<version>1.4.36</version>
<groupId>com.day.cq.dam</groupId>
<scope>provided</scope>
</dependency>
For version, please visit http://localhost:4502/system/console/depfinder on AEM with the updated SP.
Add the "com.day.cq.dam.entitlement.api.EntitlementConstants" in Package textbox and click find. Copy the version displayed
Aanchal Sikka