طبقة تسجيل الدخول لكل موقع

const url = 'https://api.deck.co/v2/credentials';

const res = await fetch(url, {
  method: 'POST',
  headers: {
    Authorization: `Bearer ${DECK_API_KEY}`,
  },
  body: JSON.stringify({
    source_id: 'src_9b2d4f6a8c0e',
    auth_method: 'username_password',
    auth_credentials: { username, password },
    external_id: user.id,
  }),
});

// → { "id": "cred_5f8a2c91b7e3",
//     "status": "unverified" }