We have added vouchers to the payment part of the system. Vouchers are strings like
MV4U-U2TC-GIYX-OSLK-N5UU-26TD-NFGE-GSTL-MFME-42TC-GNLH-KZCD-JE3E-S2SV-O5EW-4MBO-KFJX-E3SK-NZ5F
and are specific to a certain competition and (optionally) a user. The voucher contains a certain discount amount: 0-100%. The organisers can generate vouchers via a plugin.
When the user enters the voucher, it is decrypted and matched against the competition and user. If it is correct, the price is immediately updated and – in the case of a 100% discount – the photos are marked as paid.
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