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Como validar o Webhook Signature?

Toda request do Webhook possui o header 'x-webhook-signature' que é a signature gerada com a secret key da Woovi e o payload do Webhook. Ao receber o header você pode validar se o signature é válido e dar continuidade no fluxo do Webhook.

Exemplo: 'x-webhook-signature': 'lL2nnXgmLFGgxJ8+jCDguqouU4ucrIxYJcU5SPrJFaNcJajTJHYVldqc/z4YFIjAjtPEALe699WosgPY08W7CLpidvtm06Qwa4YMB0l/DcTS93O91NdSH/adjugEKiOb76Zj/0jB8mqOmWCFYbweOBa17bssuEkd5Lw7Q5L314Y='

Exemplo de validação​

<?php

function verifyPayload($payload, $signature) {
  $publicKeyBase64 = 'LS0tLS1CRUdJTiBQVUJMSUMgS0VZLS0tLS0KTUlHZk1BMEdDU3FHU0liM0RRRUJBUVVBQTRHTkFEQ0JpUUtCZ1FDLytOdElranpldnZxRCtJM01NdjNiTFhEdApwdnhCalk0QnNSclNkY2EzcnRBd01jUllZdnhTbmQ3amFnVkxwY3RNaU94UU84aWVVQ0tMU1dIcHNNQWpPL3paCldNS2Jxb0c4TU5waS91M2ZwNnp6MG1jSENPU3FZc1BVVUcxOWJ1VzhiaXM1WloySVpnQk9iV1NwVHZKMGNuajYKSEtCQUE4MkpsbitsR3dTMU13SURBUUFCCi0tLS0tRU5EIFBVQkxJQyBLRVktLS0tLQo=';

  $publicKey = base64_decode($publicKeyBase64);

  $verify = openssl_verify($payload, base64_decode($signature), $publicKey, "sha256WithRSAEncryption");

  return $verify;
}
// replace to the payload received
$payload = '{ "pixQrCode": null, "charge": { "status": "COMPLETED", "customer": { "name": "Antonio Victor", "taxID": { "taxID": "12345678976", "type": "BR:CPF" }, "email": "antoniocliente@example.com", "correlationID": "4979ceba-2132-4292-bd90-bee7fb2125e4" }, "value": 1000, "comment": "Pagamento OpenPix", "transactionID": "ea83401ed4834b3ea6f1f283b389af29", "correlationID": "417bae21-3d08-4cdb-9c2d-fee63c89e9e4", "paymentLinkID": "34697ed2-3790-4b60-8512-e7465b142d84", "createdAt": "2021-03-12T12:43:54.528Z", "updatedAt": "2021-03-12T12:44:09.360Z", "brCode": "https://api.openpix.com.br/openpix/openpix/testing?transactionID=ea83401ed4834b3ea6f1f283b389af29" }, "pix": { "charge": { "status": "COMPLETED", "customer": { "name": "Antonio Victor", "taxID": { "taxID": "12345678976", "type": "BR:CPF" }, "email": "antoniocliente@example.com", "correlationID": "4979ceba-2132-4292-bd90-bee7fb2125e4" }, "value": 1000, "comment": "Pagamento OpenPix", "transactionID": "ea83401ed4834b3ea6f1f283b389af29", "correlationID": "417bae21-3d08-4cdb-9c2d-fee63c89e9e4", "paymentLinkID": "34697ed2-3790-4b60-8512-e7465b142d84", "createdAt": "2021-03-12T12:43:54.528Z", "updatedAt": "2021-03-12T12:44:09.360Z" }, "customer": { "correlationID": "9134e286-6f71-427a-bf00-241681624586", "email": "email1@example.com", "name": "Loma", "phone": "+5511999999999", "taxID": { "taxID": "47043622050", "type": "BR:CPF" } }, "payer": { "correlationID": "9134e286-6f71-427a-bf00-241681624586", "email": "email1@example.com", "name": "Loma", "phone": "+5511999999999", "taxID": { "taxID": "47043622050", "type": "BR:CPF" } }, "time": "2021-03-12T12:44:09.269Z", "value": 1, "transactionID": "ea83401ed4834b3ea6f1f283b389af29", "infoPagador": "OpenPix testing" }, "company": { "id": "624f46f9e93f9f521c8308d7", "name": "Pizzaria do José", "taxID": "4722767300014" }, "account": { "clientId": "ZOJ64B9B-ZM1W-89MI-4UCI-OP2LVIU6NY75" } }';

// replace to the header signature received into x-webhook-signature
$signature = 'lL2nnXgmLFGgxJ8+jCDguqouU4ucrIxYJcU5SPrJFaNcJajTJHYVldqc/z4YFIjAjtPEALe699WosgPY08W7CLpidvtm06Qwa4YMB0l/DcTS93O91NdSH/adjugEKiOb76Zj/0jB8mqOmWCFYbweOBa17bssuEkd5Lw7Q5L314Y=';

$isValid = verifyPayload($payload, $signature);

if ($isValid) {
  echo "Valid signature\n";
} else {
  echo "Invalid signature\n";
}