add validation in request

src/main/java/com/billpaymentservice/bbps/dto/auth/RegisterRequest.java

@@ -2,15 +2,31 @@ package com.billpaymentservice.bbps.dto.auth;
 
 import com.billpaymentservice.bbps.dto.request.BaseClass;
 
+import jakarta.validation.constraints.Email;
+import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Pattern;
+import jakarta.validation.constraints.Size;
 import lombok.Getter;
 import lombok.Setter;
 
 @Getter
 @Setter
 public class RegisterRequest extends BaseClass {
+
+	@NotNull(message = "Mobile number cannot be null.")
+	@Size(min = 10, max = 10, message = "Mobile number must be exactly 10 digits.")
+	@Pattern(regexp = "^[0-9]{10}$", message = "Mobile number must contain only 10 digits.")
 	private String mobile;
+
+	@NotNull(message = "Name cannot be null.")
+	@Size(min = 2, max = 100, message = "Name must be between 2 and 100 characters.")
 	private String name;
+
+	@NotNull(message = "Email cannot be null.")
+	@Email(message = "Email must be a valid email address.")
 	private String email;
+
+	@NotNull(message = "Registration token cannot be null.")
 	private String registrationToken;
 
 }