wind on ‘credit’

[Ksguo]

Hello，
In ‘Gas Smart Meter Functional Specification’，I read such a sentence：‘Provisions to ensure meter functionality configuration is subject to appropriate access control, i.e. only Authorised Parties can wind on credit, demand readings or update tariff data’.
What is meant by ‘wind on credit’，please？
This phrase also shows up in another place in the document：‘To be used when communications has failed – e.g. customer enters code via keypad Interface. Could also be used by engineer to wind on ‘credit’

[Mister Micawber]

.
I have an idea that it may mean 'add credit' to the customer's meter, for instance when the customers sell their own solar-produced energy to the utility corporation.
.
_________________
Native English teacher at Mister Micawber's