WebhooksService class is missing

[mojari]

Hi Team,
WebhooksService and verifyPayload function is missing from code. Probably it is not submitted.

WebhooksService service = webhooksServiceFactory.getWebhooksService();
return service.verifyPayload(signature, payload);

[mojari]

Also StringUtils function/file is missing.

[mojari]

If there is any sample program doing this validation including above all the files.

[Wave-c]

Also StringUtils function/file is missing.

use any other implementation
For example: org.springframework.util.StringUtils