src/Certificate/FileCertificateProvider.php
protected function persistCertificate($certificateChainUri, $certificateContents)
    {
        $this->filesystem->put($this->calculateFilePath($certificateChainUri), $certificateContents);
    }
protected function persistCertificate($certificateChainUri, $certificateContents)
    {
        $this->filesystem->put($this->calculateFilePath($certificateChainUri), $certificateContents);
    }
Persist the certificate contents to data store so it's retrievable using the certificate chain uri

@param string $certificateChainUri
@param string $certificateContents