diff --git a/src/lib/entities.ts b/src/lib/entities.ts
new file mode 100644
index 0000000..d799bc8
--- /dev/null
+++ b/src/lib/entities.ts
@@ -0,0 +1,153 @@
+
+// TYPES {{{
+
+import { BASE_API_URL } from "./api";
+import type { ErrorMessage, Message } from "./api";
+
+//
+export interface Type {
+  color: string;
+  comment: string;
+  id: number;
+  name: string;
+}
+
+export interface Card {
+  balance: number;
+  credit_line: number;
+  have_credit_line: boolean;
+  id: number;
+  name: string;
+}
+
+//
+// }}}
+//
+
+
+export async function getAll<T>(groupName: string, session?: string): Promise<T[] | ErrorMessage> {
+  const url = `${BASE_API_URL}/${groupName}/all`
+  const defaultHeaders = {
+    'Content-Type': 'application/json',
+  };
+
+  const headers = session
+    ? { ...defaultHeaders, Cookie: `session=${session}` }
+    : defaultHeaders
+
+  const config: RequestInit = {
+    headers
+  };
+
+  try {
+    const response = await fetch(url, config);
+    if (!response.ok) {
+      const body = await response.json()
+      throw new Error(`Failed to fetch ${groupName}: ${body.message}`);
+    }
+    return await response.json() as T[];
+  } catch (err) {
+    const error = err as Error
+    return { message: error.message };
+  }
+}
+
+export async function getByID<T>(groupName: string, id: number): Promise<T | ErrorMessage> {
+  try {
+    const response = await fetch(`${BASE_API_URL}/${groupName}/${id}`);
+    if (!response.ok) {
+      throw new Error(`Failed to fetch ${groupName} by ID: ${response.statusText}`);
+    }
+    return await response.json() as T;
+  } catch (err) {
+    const error = err as Error
+    return { message: error.message };
+  }
+}
+
+export async function create<T>(groupName: string, data: T, session?: string): Promise<Message | ErrorMessage> {
+  const url = `${BASE_API_URL}/${groupName}/add`
+  const defaultHeaders = {
+    'Content-Type': 'application/json',
+  };
+
+  const headers = session
+    ? { ...defaultHeaders, Cookie: `session=${session}` }
+    : defaultHeaders
+
+  const config: RequestInit = {
+    method: 'POST',
+    headers,
+    body: JSON.stringify(data)
+  };
+
+  console.log(data)
+
+  try {
+    const response = await fetch(url, config);
+    if (!response.ok) {
+      const body = await response.json()
+      throw new Error(`Failed to create ${groupName}: ${body.message}`);
+    }
+    return await response.json() as Message;
+  } catch (err) {
+    const error = err as Error
+    return { message: error.message };
+  }
+}
+
+export async function update<T>(groupName: string, id: number, data: T, session?: string): Promise<T | ErrorMessage> {
+  const url = `${BASE_API_URL}/${groupName}/edit/${id}`
+  const defaultHeaders = {
+    'Content-Type': 'application/json',
+  };
+
+  const headers = session
+    ? { ...defaultHeaders, Cookie: `session=${session}` }
+    : defaultHeaders
+
+  const config: RequestInit = {
+    method: 'PUT',
+    headers,
+    body: JSON.stringify(data)
+  };
+
+  try {
+    const response = await fetch(url, config);
+    if (!response.ok) {
+      const body = await response.json()
+      throw new Error(`Failed to update ${groupName}: ${body.message}`);
+    }
+    return await response.json() as T;
+  } catch (err) {
+    const error = err as Error
+    return { message: error.message };
+  }
+}
+
+export async function remove<T>(groupName: string, id: number, session?: string): Promise<T | ErrorMessage> {
+  const url = `${BASE_API_URL}/${groupName}/delete/${id}`
+  const defaultHeaders = {
+    'Content-Type': 'application/json',
+  };
+
+  const headers = session
+    ? { ...defaultHeaders, Cookie: `session=${session}` }
+    : defaultHeaders
+
+  const config: RequestInit = {
+    method: 'DELETE',
+    headers,
+  };
+
+  try {
+    const response = await fetch(url, config);
+    if (!response.ok) {
+      throw new Error(`Failed to delete ${groupName}: ${response.statusText}`);
+    }
+    return await response.json() as T;
+  } catch (err) {
+    const error = err as Error
+    return { message: error.message };
+  }
+}