diff --git a/modules/customers/src/api/domain/aggregates/customer.ts b/modules/customers/src/api/domain/aggregates/customer.ts
index ea304a99..efef5503 100644
--- a/modules/customers/src/api/domain/aggregates/customer.ts
+++ b/modules/customers/src/api/domain/aggregates/customer.ts
@@ -52,7 +52,44 @@ export type CustomerPatchProps = Partial<Omit<CustomerProps, "companyId" | "addr
   address?: PostalAddressPatchProps;
 };
 
-export class Customer extends AggregateRoot<CustomerProps> {
+// Customer
+export interface ICustomer {
+  // comportamiento
+  update(partialCustomer: CustomerPatchProps): Result<Customer, Error>;
+
+  // propiedades (getters)
+  readonly isIndividual: boolean;
+  readonly isCompany: boolean;
+  readonly isActive: boolean;
+
+  readonly companyId: UniqueID;
+
+  readonly reference: Maybe<Name>;
+  readonly name: Name;
+  readonly tradeName: Maybe<Name>;
+  readonly tin: Maybe<TINNumber>;
+
+  readonly address: PostalAddress;
+
+  readonly emailPrimary: Maybe<EmailAddress>;
+  readonly emailSecondary: Maybe<EmailAddress>;
+
+  readonly phonePrimary: Maybe<PhoneNumber>;
+  readonly phoneSecondary: Maybe<PhoneNumber>;
+  readonly mobilePrimary: Maybe<PhoneNumber>;
+  readonly mobileSecondary: Maybe<PhoneNumber>;
+  readonly fax: Maybe<PhoneNumber>;
+
+  readonly website: Maybe<URLAddress>;
+  readonly legalRecord: Maybe<TextValue>;
+
+  readonly defaultTaxes: Collection<TaxCode>;
+
+  readonly languageCode: LanguageCode;
+  readonly currencyCode: CurrencyCode;
+}
+
+export class Customer extends AggregateRoot<CustomerProps> implements ICustomer {
   static create(props: CustomerProps, id?: UniqueID): Result<Customer, Error> {
     const contact = new Customer(props, id);
 
@@ -60,9 +97,9 @@ export class Customer extends AggregateRoot<CustomerProps> {
     // ...
     // ...
 
-    // 🔹 Disparar evento de dominio "CustomerAuthenticatedEvent"
-    //const { contact } = props;
-    //user.addDomainEvent(new CustomerAuthenticatedEvent(id, contact.toString()));
+    // Disparar eventos de dominio
+    // ...
+    // ...
 
     return Result.ok(contact);
   }
diff --git a/modules/customers/src/api/infrastructure/mappers/queries/customer.list.mapper.ts b/modules/customers/src/api/infrastructure/mappers/queries/customer.list.mapper.ts
index de48b466..59ece247 100644
--- a/modules/customers/src/api/infrastructure/mappers/queries/customer.list.mapper.ts
+++ b/modules/customers/src/api/infrastructure/mappers/queries/customer.list.mapper.ts
@@ -39,12 +39,12 @@ export type CustomerListDTO = {
 
   address: PostalAddress;
 
-  email_primary: Maybe<EmailAddress>;
-  email_secondary: Maybe<EmailAddress>;
-  phone_primary: Maybe<PhoneNumber>;
-  phone_secondary: Maybe<PhoneNumber>;
-  mobile_primary: Maybe<PhoneNumber>;
-  mobile_secondary: Maybe<PhoneNumber>;
+  emailPrimary: Maybe<EmailAddress>;
+  emailSecondary: Maybe<EmailAddress>;
+  phonePrimary: Maybe<PhoneNumber>;
+  phoneSecondary: Maybe<PhoneNumber>;
+  mobilePrimary: Maybe<PhoneNumber>;
+  mobileSecondary: Maybe<PhoneNumber>;
 
   fax: Maybe<PhoneNumber>;
   website: Maybe<URLAddress>;
@@ -225,12 +225,12 @@ export class CustomerListMapper
 
       address: postalAddress!,
 
-      email_primary: emailPrimaryAddress!,
-      email_secondary: emailSecondaryAddress!,
-      phone_primary: phonePrimaryNumber!,
-      phone_secondary: phoneSecondaryNumber!,
-      mobile_primary: mobilePrimaryNumber!,
-      mobile_secondary: mobileSecondaryNumber!,
+      emailPrimary: emailPrimaryAddress!,
+      emailSecondary: emailSecondaryAddress!,
+      phonePrimary: phonePrimaryNumber!,
+      phoneSecondary: phoneSecondaryNumber!,
+      mobilePrimary: mobilePrimaryNumber!,
+      mobileSecondary: mobileSecondaryNumber!,
       fax: faxNumber!,
       website: website!,
 
diff --git a/modules/customers/src/common/dto/response/list-customers.response.dto.ts b/modules/customers/src/common/dto/response/list-customers.response.dto.ts
index 060594c6..c890082c 100644
--- a/modules/customers/src/common/dto/response/list-customers.response.dto.ts
+++ b/modules/customers/src/common/dto/response/list-customers.response.dto.ts
@@ -19,8 +19,12 @@ export const ListCustomersResponseSchema = createListViewResponseSchema(
     postal_code: z.string(),
     country: z.string(),
 
-    email: z.string(),
-    phone: z.string(),
+    email_primary: z.string(),
+    email_secondary: z.string(),
+    phone_primary: z.string(),
+    phone_secondary: z.string(),
+    mobile_primary: z.string(),
+    mobile_secondary: z.string(),
     fax: z.string(),
     website: z.string(),
 
diff --git a/packages/rdx-ddd/src/aggregate-root.ts b/packages/rdx-ddd/src/aggregate-root.ts
index 32ffde8a..bfc84cfe 100644
--- a/packages/rdx-ddd/src/aggregate-root.ts
+++ b/packages/rdx-ddd/src/aggregate-root.ts
@@ -10,7 +10,7 @@ export abstract class AggregateRoot<T extends object> extends DomainEntity<T> {
   }
 
   /**
-   * 🔹 Agregar un evento de dominio al agregado
+   * Agregar un evento de dominio al agregado
    */
   protected addDomainEvent(event: IDomainEvent): void {
     this._domainEvents.push(event);
@@ -20,14 +20,14 @@ export abstract class AggregateRoot<T extends object> extends DomainEntity<T> {
   }
 
   /**
-   * 🔹 Obtener los eventos de dominio pendientes
+   * Obtener los eventos de dominio pendientes
    */
   get domainEvents(): IDomainEvent[] {
     return this._domainEvents;
   }
 
   /**
-   * 🔹 Limpiar la lista de eventos después de procesarlos
+   * Limpiar la lista de eventos después de procesarlos
    */
   public clearDomainEvents(): void {
     this._domainEvents.splice(0, this._domainEvents.length);
diff --git a/packages/rdx-utils/src/helpers/maybe.ts b/packages/rdx-utils/src/helpers/maybe.ts
index 03560cab..b2187c74 100644
--- a/packages/rdx-utils/src/helpers/maybe.ts
+++ b/packages/rdx-utils/src/helpers/maybe.ts
@@ -9,7 +9,16 @@
  *  console.log(noValue.isSome()); // false
  **/
 
-export class Maybe<T> {
+export interface IMaybe<T> {
+  isSome(): boolean;
+  isNone(): boolean;
+  unwrap(): T | undefined;
+  getOrUndefined(): T | undefined;
+  map<U>(fn: (value: T) => U): IMaybe<U>;
+  match<U>(someFn: (value: T) => U, noneFn: () => U): U;
+}
+
+export class Maybe<T> implements IMaybe<T> {
   private constructor(private readonly value?: T) {}
 
   static fromNullable<T>(value?: T): Maybe<T> {