Build for India's developer economy

const API_KEY = 'your_api_key_here';
const BASE = 'https://aplicious.com/api/v1/india';

// Validate GSTIN at B2B checkout
async function validateGSTIN(gstin) {
  const res = await fetch(`${BASE}/gstin?gstin=${gstin}`, {
    headers: { 'x-api-key': API_KEY }
  });
  const { data } = await res.json();
  return { state: data.state, entityType: data.pan_entity_type, valid: data.valid };
}

// Full KYC bundle — PAN + GSTIN + UPI + IFSC in parallel
async function kycBundle({ pan, gstin, vpa, ifsc }) {
  const [panRes, gstinRes, upiRes, ifscRes] = await Promise.all([
    fetch(`${BASE}/pan?pan=${pan}`, { headers: { 'x-api-key': API_KEY } }),
    gstin ? fetch(`${BASE}/gstin?gstin=${gstin}`, { headers: { 'x-api-key': API_KEY } }) : null,
    vpa ? fetch(`${BASE}/upi?vpa=${encodeURIComponent(vpa)}`, { headers: { 'x-api-key': API_KEY } }) : null,
    fetch(`${BASE}/ifsc?ifsc=${ifsc}`, { headers: { 'x-api-key': API_KEY } }),
  ]);
  return {
    pan: (await panRes.json()).data,
    gstin: gstinRes ? (await gstinRes.json()).data : null,
    upi: upiRes ? (await upiRes.json()).data : null,
    bank: (await ifscRes.json()).data,
  };
}

// In-hand salary for offer letter tool
async function salaryBreakdown(ctc, regime = 'new') {
  const { data } = await fetch(
    `${BASE}/tax?income=${ctc}&regime=${regime}`,
    { headers: { 'x-api-key': API_KEY } }
  ).then(r => r.json());
  return {
    totalTax: data.total_tax_payable,
    inHandMonthly: data.in_hand_monthly,
    effectiveRate: data.effective_tax_rate_pct + '%',
    slabs: data.slab_breakdown,
  };
}