diff --git a/common.ts b/common.ts
index 7987f96..bc845af 100644
--- a/common.ts
+++ b/common.ts
@@ -40,3 +40,26 @@ export function paginacionToSearchParams(
     searchParams.set("pageNumber", "1");
   }
 }
+
+export interface QueryCustomer {
+  type: TipoDeDocumento;
+  number: string;
+}
+export function queryCustomerToSearchParams(
+  cliente: QueryCustomer,
+  searchParams: URLSearchParams
+) {
+  if (cliente) {
+    searchParams.set("documentType", cliente.type.toString());
+    searchParams.set("documentNumber", cliente.number);
+  }
+}
+
+export enum TipoDeDocumento {
+  CUIT = 80,
+  CUIL = 86,
+  CDI = 87,
+  LE = 89,
+  LC = 90,
+  DNI = 96,
+}
diff --git a/customer.ts b/customer.ts
index 6d7fd9d..65e77e3 100644
--- a/customer.ts
+++ b/customer.ts
@@ -1,12 +1,16 @@
 import {
+  QueryCustomer,
   HOST,
   Paginacion,
   paginacionToSearchParams,
   Paging,
+  queryCustomerToSearchParams,
+  TipoDeDocumento,
 } from "./common.js";
 
 export interface CustomerQuery {
   paginacion?: Paginacion;
+  customer?: QueryCustomer;
 }
 
 export interface Customer {
@@ -23,7 +27,7 @@ export interface Customer {
   MobilePhoneNumber: string;
   WebPage: string;
   IvaCategoryCode: string;
-  DocumentType: string;
+  DocumentType: TipoDeDocumento;
   DocumentNumber: string;
   PriceListNumber: number;
   Discount: number;
@@ -79,6 +83,9 @@ export async function getCustomers(
 ): Promise<CustomerResponse> {
   let searchParams = new URLSearchParams();
   paginacionToSearchParams(options.paginacion, searchParams);
+  if (options.customer) {
+    queryCustomerToSearchParams(options.customer, searchParams);
+  }
   const res = await fetch(
     `${HOST}/api/Aperture/Customer?${searchParams.toString()}`,
     {
diff --git a/priceByCustomer.ts b/priceByCustomer.ts
index 052fc8a..b31b0af 100644
--- a/priceByCustomer.ts
+++ b/priceByCustomer.ts
@@ -1,4 +1,6 @@
 import {
+  QueryCustomer,
+  queryCustomerToSearchParams,
   HOST,
   Paginacion,
   paginacionToSearchParams,
@@ -9,6 +11,7 @@ export interface PriceByCustomerQuery {
   paginacion?: Paginacion;
   /// Filtro por el código del cliente ("Code" en Customer.)
   filter?: string;
+  customer?: QueryCustomer;
 }
 
 export interface Precio {
@@ -32,6 +35,9 @@ export async function getPricesByCustomer(
   if (options.filter) {
     searchParams.set("filter", options.filter);
   }
+  if (options.customer) {
+    queryCustomerToSearchParams(options.customer, searchParams);
+  }
   const res = await fetch(
     `${HOST}/api/Aperture/PriceByCustomer?${searchParams.toString()}`,
     {