Eu crio experiências digitais que parecem vivas.

// Minimal PIX "copia e cola" payload builder
function field(id, value) {
  const len = String(value.length).padStart(2, "0");
  return id + len + value;
}

function crc16(payload) {
  let crc = 0xffff;
  for (const ch of payload) {
    crc ^= ch.charCodeAt(0) << 8;
    for (let i = 0; i < 8; i++) {
      crc = crc & 0x8000 ? (crc << 1) ^ 0x1021 : crc << 1;
      crc &= 0xffff;
    }
  }
  return crc.toString(16).toUpperCase().padStart(4, "0");
}

function buildPix({ key, name, city, amount }) {
  const mai = field("00", "br.gov.bcb.pix") + field("01", key);
  let p =
    field("00", "01") +
    field("26", mai) +
    field("52", "0000") +
    field("53", "986") +
    field("54", amount.toFixed(2)) +
    field("58", "BR") +
    field("59", name) +
    field("60", city) +
    field("62", field("05", "***")) +
    "6304";
  return p + crc16(p);
}

const code = buildPix({
  key: "hello@zguylherme.dev",
  name: "ZGUYLHERME",
  city: "BRASILIA",
  amount: 49.9,
});

console.log("BR Code:");
console.log(code);