Generate signature token

To generate signature token, you can use this formula :

• Signature = encrypt method rule HMAC(StringToSign, faspay_secret)

Parameter	Type
method	GET
path	define URL service that will be used (list of service)
timestamp	datetime (Y-m-d H:i:s). Sample : 2018-10-09 14:24:00
token	base64_encode (CLIENT_KEY:CLIENT_SECRET)
request_body	for this service, set request body to empty string
StringToSign	" [method]:[path]:[timestamp]:[access_token]:[request_body]:[request_body] ”
	*) without [] and ""
faspay_secret	will given by faspay