add validation in request

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

@@ -1,30 +1,42 @@
 package com.billpaymentservice.bbps.dto.auth;
 
+import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Pattern;
+import jakarta.validation.constraints.Size;
+
 public class VerifyOtpRequest {
-    private String mobile;
-    private String otp;
 
-    public VerifyOtpRequest() {
-    }
+	@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 digits.")
+	private String mobile;
 
-    public VerifyOtpRequest(String mobile, String otp) {
-        this.mobile = mobile;
-        this.otp = otp;
-    }
+	@NotNull(message = "OTP cannot be null.")
+	@Size(min = 6, max = 6, message = "OTP must be exactly 6 digits.")
+	@Pattern(regexp = "^[0-9]{6}$", message = "OTP must contain only 6 digits.")
+	private String otp;
 
-    public String getMobile() {
-        return mobile;
-    }
+	public VerifyOtpRequest() {
+	}
 
-    public void setMobile(String mobile) {
-        this.mobile = mobile;
-    }
+	public VerifyOtpRequest(String mobile, String otp) {
+		this.mobile = mobile;
+		this.otp = otp;
+	}
 
-    public String getOtp() {
-        return otp;
-    }
+	public String getMobile() {
+		return mobile;
+	}
 
-    public void setOtp(String otp) {
-        this.otp = otp;
-    }
+	public void setMobile(String mobile) {
+		this.mobile = mobile;
+	}
+
+	public String getOtp() {
+		return otp;
+	}
+
+	public void setOtp(String otp) {
+		this.otp = otp;
+	}
 }