vendor/braintree/braintree_php/lib/Braintree/SignatureService.php

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<?php

//phpcs:disable PEAR.Commenting
namespace Braintree;

class SignatureService
{
    // phpcs:ignore PEAR.Commenting.FunctionComment.Missing
    public function __construct($key, $digest)
    {
        $this->key = $key;
        $this->digest = $digest;
    }

    public function sign($payload)
    {
        return $this->hash($payload) . "|" . $payload;
    }

    public function hash($data)
    {
        return call_user_func($this->digest, $this->key, $data);
    }
}