MDB cashless retrofit

MDB cashless vending retrofit board for QR and API payment flows.

Use QuLink when existing MDB vending machines need cashless payment, QR scan-to-pay, wallet callback, vend authorization, and event upload without replacing the whole machine.

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MDB cashlessQR/wallet callbackVend resultTelemetry

Project fit

For existing MDB vending fleets

Buyer signals

Operators adding QR or wallet payment to MDB vending machines.
Payment apps that need a machine-side board for vend authorization.
Retrofit projects where the vending controller should remain in place.
Deployments that need telemetry, vend result, and fault upload.

What to send first

Machine photo or existing board photo
Interface or wiring note if available
Target action after API command or payment
Whether telemetry or data upload is required

Integration model

Cashless payment plus machine-side MDB handling

QuLink bridges payment approval and MDB vend behavior, then reports vend result and machine events to your backend.

Machine interface: MDB cashless path, vending controller, optional auxiliary relay/serial
Trigger source: QuLink QR payment, wallet callback, payment app, or server approval
Data returned: payment reference, vend.result, fault, telemetry, online status
Project mode: MDB retrofit, payment app integration, vending operator rollout

Workflow

From machine interface to API-controlled result.

Check MDB compatibility

Confirm machine model, MDB wiring, and existing payment module behavior.

Map payment approval

Define wallet/QR/payment callback and vend authorization rules.

Authorize vend

QuLink handles the machine-side vend action and timing.

Report result

Your backend receives vend result and fault/status events.

API example

A clear server command or webhook for the machine-side action.

The exact command fields depend on machine interface, firmware profile, and whether payment or your own app triggers the action.

POST /v1/devices/MDB-77/commands
{
  "command": "dispense",
  "source": "wallet_callback",
  "machine_action": {
    "interface": "mdb_cashless",
    "slot": "C03"
  }
}

Start the project

Send the first machine details before writing a full spec.

Send the MDB machine model, current payment module photo, target payment flow, vend behavior, and rollout quantity.

Useful first message

Machine type and target country
Machine photo, board photo, or wiring photo
Action after API command or payment
Data upload and estimated quantity

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FAQ

Questions buyers usually ask before a sample test.

Can QuLink work with a third-party wallet?

Yes. The wallet or payment app can confirm payment and trigger QuLink through the API.

Is this different from a full vending controller?

Yes. This page targets retrofit and cashless integration, while OEM controller projects can go deeper into firmware and board design.

Can it support vending fleets?

Yes. Fleet rollout needs sample validation, interface confirmation, and deployment profile tuning.

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