added dto and entityn for biller

src/main/java/com/billpaymentservice/bbps/dto/BillerAdditonalInfoDTO.java

@@ -0,0 +1,15 @@
+package com.billpaymentservice.bbps.dto;
+
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+public class BillerAdditonalInfoDTO {
+	  private String paramConfigId;
+      private String paramName;
+      private String dataTypeDAO;
+	  private String dataTypeModel;
+	  private boolean optional;
+	  private boolean visibility;
+}

src/main/java/com/billpaymentservice/bbps/entites/BillerAdditionalInfoPayment.java

@@ -0,0 +1,47 @@
+package com.billpaymentservice.bbps.entites;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.Table;
+import jakarta.validation.constraints.NotBlank;
+import lombok.Getter;
+import lombok.Setter;
+@Getter
+@Setter
+@Table(name = "biller_additional_additional_info_payment")
+@Entity
+public class BillerAdditionalInfoPayment {
+	     @Id
+	    @GeneratedValue(strategy = GenerationType.IDENTITY)
+	    private Long id;  // primary key for the table
+
+	    @Column(name = "param_config_id", nullable = false)
+	    @NotBlank(message = "Param Config ID cannot be blank")
+	    private String paramConfigId;
+
+	    @Column(name = "param_name", nullable = false)
+	    @NotBlank(message = "Param name cannot be blank")
+	    private String paramName;
+
+	    @Column(name = "data_type_dao")
+	    private String dataTypeDAO;
+
+	    @Column(name = "data_type_model")
+	    private String dataTypeModel;
+
+	    @Column(name = "optional", nullable = false)
+	    private boolean optional;
+
+	    @Column(name = "visibility", nullable = false)
+	    private boolean visibility;
+
+	    // 🔗 Many AdditionalInfos belong to one Biller
+	    @ManyToOne
+	    @JoinColumn(name = "biller_id", nullable = false)
+	    private BillerDetails biller;
+}