Hey, it looks like you were very close. This is how i solved that problem: $success = (
openssl_verify(
data: implode(separator: '|', array: [
$httpPayPalTransmissionId,
$httpPayPalTransmissionTime,
$webhookID,
crc32(string: $rawRequestBody),
]),
signature: base64_decode(string: $httpPayPalTransmissionSignature),
public_key: openssl_pkey_get_public(public_key: file_get_contents(filename: $httpPayPalCertUrl)),
algorithm: 'sha256WithRSAEncryption'
) === 1
);
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