diff --git a/docs/.vitepress/config.ts b/docs/.vitepress/config.ts
index 357bf8e..c69907f 100644
--- a/docs/.vitepress/config.ts
+++ b/docs/.vitepress/config.ts
@@ -11,16 +11,6 @@ export default defineConfig({
       { text: 'API Reference', link: '/api' },
     ],
 
-    sidebar: [
-      {
-        text: 'Examples',
-        items: [
-          { text: 'Markdown Examples', link: '/markdown-examples' },
-          { text: 'Runtime API Examples', link: '/api-examples' },
-        ],
-      },
-    ],
-
     socialLinks: [
       { icon: 'github', link: 'https://github.com/azabroflovski/mxik-js' },
     ],
diff --git a/docs/api.md b/docs/api.md
new file mode 100644
index 0000000..6996c2a
--- /dev/null
+++ b/docs/api.md
@@ -0,0 +1,656 @@
+# API References
+
+
+## ResponseSchema
+
+```typescript
+/**
+ * Represents a general API response schema.
+ *
+ * @template Data - The type of the data returned in the response.
+ */
+interface ResponseSchema<Data> {
+  /**
+   * Indicates whether the request was successful.
+   * @type {boolean}
+   */
+  success: boolean
+
+  /**
+   * The HTTP status code of the response.
+   * @type {number}
+   */
+  code: number
+
+  /**
+   * A reason or message describing the response status.
+   * @type {string}
+   */
+  reason: string
+
+  /**
+   * The data returned in the response.
+   * @type {Data | null}
+   */
+  data: Data | null
+
+  /**
+   * The total number of records.
+   * @type {number}
+   */
+  recordTotal: number
+
+  /**
+   * Any errors that occurred during the request.
+   * @type {any}
+   */
+  errors: any
+}
+```
+
+## ResponseSchemaWithContent
+
+```typescript
+/**
+ * Represents a detailed API response schema with pagination and sorting information.
+ *
+ * @template Data - The type of the data returned in the response.
+ */
+interface ResponseSchemaWithContent<Data> {
+  /**
+   * Indicates whether the request was successful.
+   * @type {boolean}
+   */
+  success: boolean
+
+  /**
+   * The HTTP status code of the response.
+   * @type {number}
+   */
+  code: number
+
+  /**
+   * A reason or message describing the response status.
+   * @type {string}
+   */
+  reason: string
+
+  /**
+   * The data returned in the response, including pagination and sorting metadata.
+   * @type {{
+   *   content: Data | null,
+   *   empty: boolean,
+   *   first: boolean,
+   *   last: boolean,
+   *   number: number,
+   *   numberOfElements: number,
+   *   size: number,
+   *   totalElements: number,
+   *   totalPages: number,
+   *   pageable: {
+   *     offset: number,
+   *     pageNumber: number,
+   *     pageSize: number,
+   *     paged: boolean,
+   *     unpaged: boolean,
+   *     sort: ResponseSort
+   *   },
+   *   sort: ResponseSort
+   * }}
+   */
+  data: {
+    content: Data | null
+    empty: boolean
+    first: boolean
+    last: boolean
+    number: number
+    numberOfElements: number
+    size: number
+    totalElements: number
+    totalPages: number
+    pageable: {
+      offset: number
+      pageNumber: number
+      pageSize: number
+      paged: boolean
+      unpaged: boolean
+      sort: ResponseSort
+    }
+    sort: ResponseSort
+  }
+
+  /**
+   * Any errors that occurred during the request.
+   * @type {any}
+   */
+  errors: any
+}
+
+/**
+ * Represents sorting information in a paginated response.
+ */
+interface ResponseSort {
+  /**
+   * Indicates whether sorting is empty.
+   * @type {boolean}
+   */
+  empty: boolean
+
+  /**
+   * Indicates whether the sorting is sorted.
+   * @type {boolean}
+   */
+  sorted: boolean
+
+  /**
+   * Indicates whether the sorting is unsorted.
+   * @type {boolean}
+   */
+  unsorted: boolean
+}
+```
+
+
+
+## SearchResultItem
+
+- Type
+
+```typescript
+/**
+ * Represents an item returned from a search query.
+ */
+interface SearchResultItem {
+    /**
+     * The MXIK code of the item.
+     * @type {string}
+     */
+    mxikCode: string
+
+    /**
+     * The name of the item.
+     * @type {string}
+     */
+    name: string
+
+    /**
+     * A description of the item.
+     * @type {string}
+     */
+    description: string
+
+    /**
+     * The international code of the item.
+     * @type {string | null}
+     */
+    internationalCode: string | null
+
+    /**
+     * The label of the item.
+     * @type {string}
+     */
+    label: string
+
+    /**
+     * The full name of the item.
+     * @type {string}
+     */
+    fullName: string
+
+    /**
+     * The group code of the item.
+     * @type {string}
+     */
+    groupCode: string
+
+    /**
+     * The group name of the item.
+     * @type {string}
+     */
+    groupName: string
+
+    /**
+     * The class code of the item.
+     * @type {string}
+     */
+    classCode: string
+
+    /**
+     * The class name of the item.
+     * @type {string}
+     */
+    className: string
+
+    /**
+     * The position code of the item.
+     * @type {string}
+     */
+    positionCode: string
+
+    /**
+     * The position name of the item.
+     * @type {string}
+     */
+    positionName: string
+
+    /**
+     * The sub-position code of the item.
+     * @type {string}
+     */
+    subPositionCode: string
+
+    /**
+     * The sub-position name of the item.
+     * @type {string}
+     */
+    subPositionName: string
+
+    /**
+     * The brand code of the item.
+     * @type {string}
+     */
+    brandCode: string
+
+    /**
+     * The brand name of the item.
+     * @type {string | null}
+     */
+    brandName: string | null
+
+    /**
+     * The attribute name of the item.
+     * @type {string | null}
+     */
+    attributeName: string | null
+
+    /**
+     * The package usage information.
+     * @type {string}
+     */
+    usePackage: string
+
+    /**
+     * The category unit ID.
+     * @type {string | null}
+     */
+    categoryUnitId: string | null
+
+    /**
+     * The category unit name.
+     * @type {string | null}
+     */
+    categoryUnitName: string | null
+
+    /**
+     * The units name.
+     * @type {string}
+     */
+    unitsName: string
+
+    /**
+     * The survey category ID.
+     * @type {string}
+     */
+    surveyCategoryId: string
+
+    /**
+     * Indicates whether the item is non-changeable.
+     * @type {string}
+     */
+    nonChangeable: string
+
+    /**
+     * The LGOTA ID.
+     * @type {string}
+     */
+    lgotaId: string
+
+    /**
+     * The LGOTA name.
+     * @type {string}
+     */
+    lgotaName: string
+
+    /**
+     * The recommended category unit name.
+     * @type {string | null}
+     */
+    recommendedCategoryUnitName: string | null
+
+    /**
+     * The recommended units name.
+     * @type {string | null}
+     */
+    recommendedUnitsName: string | null
+
+    /**
+     * The package name.
+     * @type {string | null}
+     */
+    packageName: string | null
+
+    /**
+     * The use card information.
+     * @type {string}
+     */
+    useCard: string
+
+    /**
+     * The property of the item.
+     * @type {string | null}
+     */
+    property: string | null
+
+    /**
+     * The category code of the item.
+     * @type {string}
+     */
+    categoryCode: string
+
+    /**
+     * The category name of the item.
+     * @type {string}
+     */
+    categoryName: string
+
+    /**
+     * The MNN name.
+     * @type {string | null}
+     */
+    mnnName: string | null
+}
+
+```
+
+## MxikDetails
+
+- Type
+
+```typescript
+interface MxikDetails {
+  /**
+   * The unique identifier of the MXIK item.
+   * @type {string}
+   */
+  id: string
+
+  /**
+   * The primary key of the MXIK item.
+   * @type {string | null}
+   */
+  pkey: string | null
+
+  /**
+   * The parent primary key of the MXIK item.
+   * @type {string | null}
+   */
+  parentPkey: string | null
+
+  /**
+   * The MXIK code of the item.
+   * @type {string}
+   */
+  mxikCode: string
+
+  /**
+   * The group name of the item in Uzbek.
+   * @type {string}
+   */
+  groupNameUz: string
+
+  /**
+   * The group name of the item in Russian.
+   * @type {string}
+   */
+  groupNameRu: string
+
+  /**
+   * The group name of the item in Latin.
+   * @type {string | null}
+   */
+  groupNameLat: string | null
+
+  /**
+   * The class name of the item in Uzbek.
+   * @type {string}
+   */
+  classNameUz: string
+
+  /**
+   * The class name of the item in Russian.
+   * @type {string}
+   */
+  classNameRu: string
+
+  /**
+   * The class name of the item in Latin.
+   * @type {string | null}
+   */
+  classNameLat: string | null
+
+  /**
+   * The position name of the item in Uzbek.
+   * @type {string}
+   */
+  positionNameUz: string
+
+  /**
+   * The position name of the item in Russian.
+   * @type {string}
+   */
+  positionNameRu: string
+
+  /**
+   * The position name of the item in Latin.
+   * @type {string | null}
+   */
+  positionNameLat: string | null
+
+  /**
+   * The sub-position name of the item in Uzbek.
+   * @type {string}
+   */
+  subPositionNameUz: string
+
+  /**
+   * The sub-position name of the item in Russian.
+   * @type {string}
+   */
+  subPositionNameRu: string
+
+  /**
+   * The sub-position name of the item in Latin.
+   * @type {string | null}
+   */
+  subPositionNameLat: string | null
+
+  /**
+   * The brand name of the item.
+   * @type {string}
+   */
+  brandName: string
+
+  /**
+   * The attribute name of the item in Uzbek.
+   * @type {string}
+   */
+  attributeNameUz: string
+
+  /**
+   * The attribute name of the item in Russian.
+   * @type {string}
+   */
+  attributeNameRu: string
+
+  /**
+   * The attribute name of the item in Latin.
+   * @type {string | null}
+   */
+  attributeNameLat: string | null
+
+  /**
+   * A description of the item.
+   * @type {string | null}
+   */
+  description: string | null
+
+  /**
+   * Indicates whether the item is active.
+   * @type {string}
+   */
+  isActive: string
+
+  /**
+   * The creation timestamp of the item.
+   * @type {string}
+   */
+  createdAt: string
+
+  /**
+   * The user who last updated the item.
+   * @type {string | null}
+   */
+  updatedBy: string | null
+
+  /**
+   * The last update timestamp of the item.
+   * @type {string}
+   */
+  updatedAt: string
+
+  /**
+   * The status of the item.
+   * @type {number}
+   */
+  status: number
+
+  /**
+   * The list of package names associated with the item.
+   * @type {PackageName[]}
+   */
+  packageNames: PackageName[]
+}
+```
+
+
+## Client
+
+- Type 
+
+```typescript
+interface Client {
+    search: (name: string) => Promise<ResponseSchema<SearchResultItem[]>>
+    brand: (name: string) => Promise<ResponseSchemaWithContent<ByParamsResultItem[]>>
+    code: (code: string | number) => Promise<ResponseSchema<MxikDetails>>
+    barcode: (code: string) => Promise<ResponseSchemaWithContent<ByParamsResultItem[]>>
+    dvCert: (certNumber: string | number) => Promise<ResponseSchemaWithContent<DvCertItem>>
+    params: (attributes: Partial<Record<keyof ByParamsResultItem, any>>) => Promise<ResponseSchemaWithContent<ByParamsResultItem[]>>
+}
+```
+
+- Example
+
+```typescript
+import { MxikClient } from 'mxik'
+
+const mxik = new MxikClient()
+```
+
+## Client.search()
+
+- Type
+
+```typescript
+type searchFn = (name: string) => Promise<ResponseSchema<SearchResultItem[]>>
+```
+
+- Example
+
+```typescript
+const mxik = new MxikClient()
+
+mxik.search('shirt')
+```
+
+## Client.code()
+
+- Type
+
+```typescript
+type codeFn = (code: string | number) => Promise<ResponseSchema<MxikDetails>>
+```
+
+- Example
+
+```typescript
+const mxik = new MxikClient()
+
+mxik.code('06111001018000000')
+```
+
+## Client.brand()
+
+- Type
+
+```typescript
+type brandFn = (name: string) => Promise<ResponseSchemaWithContent<ByParamsResultItem[]>>
+```
+
+- Example
+
+```typescript
+const mxik = new MxikClient()
+
+mxik.brand('samsung')
+```
+
+## Client.barCode()
+
+- Type
+
+```typescript
+type barCodeFn = (code: string) => Promise<ResponseSchemaWithContent<ByParamsResultItem[]>>
+```
+
+- Example
+
+```typescript
+const mxik = new MxikClient()
+
+mxik.barCode('...')
+```
+
+## Client.params()
+
+- Type
+
+```typescript
+type paramsFn = (attributes: Partial<Record<keyof ByParamsResultItem, any>>) => Promise<ResponseSchemaWithContent<ByParamsResultItem[]>>
+```
+
+- Example
+
+```typescript
+const mxik = new MxikClient()
+
+mxik.params({
+    brandName: 'samsung',
+    anotherAttr: 'apple', // just example
+})
+```
+
+## Client.dvCert()
+
+- Type
+
+```typescript
+type dvCertFn = (certNumber: string | number) => Promise<ResponseSchemaWithContent<DvCertItem>>
+```
+
+- Example
+
+```typescript
+const mxik = new MxikClient()
+
+mxik.dvCert('cert-here')
+```
diff --git a/docs/index.md b/docs/index.md
index b63a077..b8ac20a 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -73,6 +73,8 @@ await mxik.search('Футболка')
 await mxik.code('06111001018000000')
 ```
 
+Go to [API Reference](/api#client) to see more methods
+
 ## Contributing
 If you would like to contribute to the project, please read the contributing guidelines.
 
diff --git a/lib/mxik-client.ts b/lib/mxik-client.ts
index b5bf4f7..13a0e49 100644
--- a/lib/mxik-client.ts
+++ b/lib/mxik-client.ts
@@ -10,7 +10,7 @@ import {
 /**
  * A client for interacting with the MXIK API.
  */
-export class MxikClient {
+export class MxikClient implements Client {
   /**
    * Searches by keyword.
    * @param {string} name - The keyword to search for.
diff --git a/lib/types.d.ts b/lib/types.d.ts
new file mode 100644
index 0000000..c9bad51
--- /dev/null
+++ b/lib/types.d.ts
@@ -0,0 +1,8 @@
+interface Client {
+  search: (name: string) => Promise<ResponseSchema<SearchResultItem[]>>
+  brand: (name: string) => Promise<ResponseSchemaWithContent<ByParamsResultItem[]>>
+  code: (code: string | number) => Promise<ResponseSchema<MxikDetails>>
+  barcode: (code: string) => Promise<ResponseSchemaWithContent<ByParamsResultItem[]>>
+  dvCert: (certNumber: string | number) => Promise<ResponseSchemaWithContent<DvCertItem>>
+  params: (attributes: Partial<Record<keyof ByParamsResultItem, any>>) => Promise<ResponseSchemaWithContent<ByParamsResultItem[]>>
+}