How To Set Up a Nayax VPOS Card Reader for EV Charging in Tridens EV Charge

A complete guide to help you set up your Nayax VPOS card reader as a payment terminal for your electric vehicle chargers.

This guide is for CPOs and site operators who want to accept on-site card payments on EV chargers with a Nayax VPOS terminal, managed in Tridens EV Charge.

We’ll keep it simple, then go deep enough for your tech team.

Quick Overview

Nayax VPOS works as a POS terminal that takes the driver’s card payment and talks to a POS back office.

That POS connects with Tridens EV Charge over OCPI so your chargers, prices, and sessions stay in sync.

What You Need Before You Start

Before starting this setup you’ll need:

• An active Tridens EV Charge environment with your charging sites and chargers onboarded.
• A Nayax VPOS device (VPOS 5 or VPOS Touch) physically installed and powered.
• POS back office OCPI base URL from your POS provider, plus who initiates the connection.
• The ability to exchange an OCPI registration token with your POS provider.
• Decided pricing for POS sessions, set as Roaming Tariffs

How Does a Nayax Card Reader Work With Tridens EV Charge?

Nayax VPOS collects payments on-site and sends them to the POS back office.

Tridens EV Charge exposes your charging network over OCPI so the POS can discover chargers, start sessions, and receive costs.

Nayax VPOS 5 and VPOS Touch

Both serve as contactless and card-present terminals suitable for unattended EV charging.

Exact hardware wiring and connectivity come from your device manual.

Configuring Nayax VPOS with Tridens EV Charge

Let’s go through the steps required to set up your Nayax payment terminals in Tridens EV Charge.

Step 1: Create a Roaming Profile for OCPI

Go to Roaming in the left menu and create or reuse a Roaming Profile of type CPO with protocol OCPI.

Set a recognizable name, code, and your three-letter Roaming ID.

Note: You can link operator after everything else is configured.

Step 2: Add a POS Platform for Nayax

Inside the Roaming Profile, add a Roaming Platform for your POS provider.

Fill in platform name and code, the POS back office OCPI URL, the provider country, and EMSP type.

Note: you can add or change roaming tariffs later.

Step 3: Decide Who Initiates OCPI and Exchange the Token

Choose the side that starts the connection.

• If your POS provider sends you a token, paste it and click Register credentials.
• If you provide a token to your POS provider, click Generate, send them the token and your platform URL, and let them register.

You can later Update credentials to renegotiate, or Invalidate credentials to stop communication.

Step 4: Expose your Charging Infrastructure to the POS

Add unique roaming IDs for your Area, Charger, and Connector, and enable roaming on chargers.

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Step 5: Assign Roaming Tariffs to the POS Platform

Create a Roaming Tariff and its Tariff Details for energy, time, or flat fees, with validity windows and VAT.

Assign the tariff to the POS platform in step 1 of the platform wizard.

You can make detailed adjustments after basic tariff configuration by adding a Roaming tariff element in the Roaming tariff details section.

Assign the tariff to ethe POS platform in step 1 of the platfrom wizard, or later by editing the Roaming profile.

Step 6: Configure Charger Session Behavior for Smooth POS Sessions

Set meter value interval and measurands so sessions update in real time.

We recommend 15 seconds and at least kW and kWh.

Disable local or offline authorization lists on chargers so all driver authorizations go to Tridens.

This keeps prepaid, postpaid, and pay-now flows accurate.

Prevent offline sessions that start without central approval to avoid stray public charges.

Align charger timeouts with Tridens’ ready-session expiration to avoid dangling sessions.

Test The Full Flow

1. Start a session at the charger with the Nayax VPOS or via mobile app.
2. Verify live meter updates and status transitions in Tridens sessions.
3. Stop the session and confirm rating based on your Roaming Tariff.
4. Check that the POS platform receives cost info as intended.

Troubleshooting Tips

• Use secure profiles such as WSS and correct authentication. If your charger expects a token versus ID and password, set the right type.
• If credentials look stale, click Update credentials on the POS platform. If you need to stop traffic, use Invalidate credentials.
• Sessions not updating or stuck in Ready state. Check meter value interval and charger timeouts, then retest.
• POS cannot see your connector. Confirm roaming IDs are present on Area, Charger, and Connector, and roaming is enabled.

With the POS platform configured, roaming IDs in place, and tariffs assigned, your Nayax VPOS can accept card payments and let Tridens handle sessions and costs. Do a full end-to-end test before you open the site.