Applying the charging credit to the charging session is actually done automatically. This means, there is nothing specific you need to do to use it. As long as you can see the charging credit value in your Account -> Promotions section, you're all setup. Every charging session processed through the OVO Charge app or with your OVO RFID will be eligible.
If you have charging credit to spend on public charging activity in the app, the £30/€30 prepayment will still be collected from your bank card at the start of the session.
Once the charging stops and there is enough credit available to cover the whole monetary value of your charging, the prepayment is refunded back to you in full and the costs of charging are deducted from the charging credit.
For example, you have £120 of the credit available and your session comes to a total of £25. There will be a prepayment collected at the beginning of the session, then once you stop, the prepayment is sent back to you and your available charging credit will show as £95.
If you don't have enough credit to cover the costs of the session, this is how it works:
You have £10 of available credit, but the session comes to a total of £22. Your credit will still be used, but there will also be £12 taken from the prepayment, to match the total costs of charging. This means, you will receive a refund of £18 out of the £30 we collected at the start of the session.
Please note, the charging credit only covers the energy consumption costs. It is not used to pay for additional fees such as overstay, idle or connection fee.