Valida documentos con IA en Expo / React Native

import * as ImagePicker from "expo-image-picker";

export async function pickAndVerify() {
  const result = await ImagePicker.launchCameraAsync({ quality: 0.8 });
  if (result.canceled) return null;
  const asset = result.assets[0];

  const body = new FormData();
  // React Native FormData accepts { uri, name, type }
  body.append("file", { uri: asset.uri, name: "dni.jpg", type: "image/jpeg" } as never);

  // Your backend calls Constaia: never ship the key inside the app
  const res = await fetch("https://tu-backend.example/api/verify", { method: "POST", body });
  return (await res.json()) as { status: "valid" | "invalid" | "review" };
}