diff --git a/modules/doc-numbering/src/api/domain/aggregates/doc-number.ts b/modules/doc-numbering/src/api/domain/aggregates/doc-number.ts
index ed1655ae..b398448b 100644
--- a/modules/doc-numbering/src/api/domain/aggregates/doc-number.ts
+++ b/modules/doc-numbering/src/api/domain/aggregates/doc-number.ts
@@ -2,6 +2,48 @@ import { AggregateRoot, UniqueID } from "@repo/rdx-ddd";
 import { Result } from "@repo/rdx-utils";
 import { DocType } from "../value-objects";
 
+/**
+ *
+ *
+ * const num1 = DocumentNumber.create(7, "2025", "{series}/{number:0003}");
+ * console.log(num1.isSuccess, num1.data.getFormatted()); // true, "2025/007"
+ *
+ * const num2 = DocumentNumber.create(7, undefined, "{series}/{number:0003}");
+ * console.log(num2.isFailure, num2.error.message); // true, error porque falta {series}
+ *
+ *. Número simple sin padding
+ * DocumentNumber.create(123, undefined, "{number}")
+ * // → "123"
+ *
+ * 2. Número con padding
+ * DocumentNumber.create(7, undefined, "{number:0005}")
+ * // → "00007"
+ *
+ * 3. Serie + número con padding
+ * DocumentNumber.create(45, "2025", "{series}/{number:0003}")
+ * // → "2025/045"
+ *
+ * 4. Serie + número sin padding
+ * DocumentNumber.create(987, "Sucursal-01", "{series}-{number}")
+ * // → "Sucursal-01-987"
+ *
+ * 5. Año + mes + día + número
+ *
+ * (Suponiendo fecha 2025-09-26 y rawValue=12)
+ *
+ * DocumentNumber.create(12, "2025", "{year}/{month}/{day}-{number:0002}")
+ * // → "2025/09/26-12"
+ *
+ * 6. Escapes de llaves
+ * DocumentNumber.create(33, "2025", "Factura N° {{{number}}}")
+ * // → "Factura N° {33}"
+ *
+ * 7. Patrón sin número (no muy común, pero válido)
+ * DocumentNumber.create(77, "2025", "SERIE-{series}")
+ * // → "SERIE-2025"
+ *
+ */
+
 export interface DocNumberProps {
   companyId: UniqueID;
   year: number;
@@ -22,8 +64,8 @@ export class DocNumber extends AggregateRoot<DocNumberProps> {
     // ...
 
     // 🔹 Disparar evento de dominio "CustomerAuthenticatedEvent"
-    //const { contact } = props;
-    //user.addDomainEvent(new CustomerAuthenticatedEvent(id, contact.toString()));
+    // ...
+    // ...
 
     return Result.ok(docNumber);
   }
@@ -35,8 +77,59 @@ export class DocNumber extends AggregateRoot<DocNumberProps> {
   }
 
   private applyFormat(): string {
-    // Sustituye {series}, {number:000000}, {year}, etc.
-    return "";
+    // 🔹 Preprocesar escapes de llaves
+    const pattern = this.props.formatPattern
+      .replace(/{{/g, "__LBRACE__")
+      .replace(/}}/g, "__RBRACE__");
+
+    const date = new Date();
+
+    // 🔹 Expresión regular para tokens {token} o {token:0000}
+    const tokenRegex = /{([a-zA-Z]+)(?::([0]+))?}/g;
+
+    const formatted = pattern.replace(tokenRegex, (_match, token, pad) => {
+      const name = token.toLowerCase();
+
+      switch (name) {
+        case "number": {
+          const raw = String(this.props.currentValue);
+          if (pad) {
+            // validar que el especificador son sólo ceros
+            if (!/^0+$/.test(pad)) {
+              throw new Error(
+                `DocumentNumber: especificador de padding inválido en patrón '${pad}'`
+              );
+            }
+            return raw.padStart(pad.length, "0");
+          }
+          return raw;
+        }
+
+        case "series": {
+          if (!this.props.series) {
+            throw new Error(
+              "DocumentNumber: el patrón requiere {series} pero no se proporcionó serie"
+            );
+          }
+          return this.props.series;
+        }
+
+        case "year":
+          return String(date.getFullYear());
+
+        case "month":
+          return String(date.getMonth() + 1).padStart(2, "0");
+
+        case "day":
+          return String(date.getDate()).padStart(2, "0");
+
+        default:
+          throw new Error(`DocumentNumber: token desconocido {${token}}`);
+      }
+    });
+
+    // 🔹 Restaurar escapes
+    return formatted.replace(/LBRACE/g, "{").replace(/RBRACE/g, "}");
   }
 
   getFormatted(): string {