> For the complete documentation index, see [llms.txt](https://features.revver.tech/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://features.revver.tech/features/3.-opt-features/3.1-opt-checkout-features.md).

# 3.1 OPT Checkout Features

### Cash Payments

revver OPT is built in with a bank note acceptor and supports fuelling using cash as payment method.

When a customer fuels less that the cash payment, the revver OPT supports printing of a dynamic overpayment voucher that can be redeemed in the station.

#### Vouchers

These vouchers generated by the OPT can later be used for filling by the customers. 

### Cards

#### Bank Cards

The card entry includes tap, chip entry, swipe. These include VISA, Mastercard, Amex, Postfinance etc.

#### Fuel Cards

Fuel cards can be accepted by scan, magstripe entry based on terminal support. Currently this includes SOCAR card, Tamoil card, DKV, UTA etc.

### Loyalty

Scanning of loyalty cards, awardingof points is supported by the Revver OPT.