add billing
add FreeTrialLeftDays
add GetPaymentSession
add SyncBilling
add ActiveUserCount
add country and phone
add freeOrg
Add NeedPayError
Merge branch 'master' into qortex-payment

Conflicts:
	api.go
add validate payment
add paymnent admin v1
add sync past payments
add PastPayments in api
add CanSeeBilling check
Merge branch 'master' into qortex-payment
Add ResetTrail
add set trial deadline
add Mark as Sample Org API
Add CreateDemoOrg and CreateDemoMember
rename demo to sandbox, demo is easy to mixed with sample