Fetch signature
GET https://signitic.app/public/api/<API_KEY>/<email>
RESPONSES
status: OK
{"success":true,"html":"\u003cbody\u003e\u003cp\u003eMy Signature\u003c/p\u003e\u003c/body\u003e"}
GET https://signitic.app/public/api/<API_KEY>/<email>
status: OK
{"success":true,"html":"\u003cbody\u003e\u003cp\u003eMy Signature\u003c/p\u003e\u003c/body\u003e"}