Get Started with OnPay
Get Started with OnPay
Welcome to OnPay.
Let's get your business ready to accept payments in 4 steps.
Step 1: Confirm your business details
Dashboard → Settings → General Settings
Check that your business information is complete and accurate — your company name, address, and contact details. This information is used for payment notifications and managing your account.
You'll also find settings for production mode, test mode, and transaction references. These control how payments are processed. Production mode needs to be enabled before you can accept real payments — we'll cover that in Step 4.
Learn more about General Settings
Step 2: Connect payment processing
Dashboard → Settings → Acquirers
To accept card payments, you need a payment processor (called an acquirer). This is the financial partner who moves money from your customer's card to your bank account. An acquirer agreement is required to process payments.
OnPay works with multiple payment processors. Based on your account setup, you'll see the acquirers available to you. Clearhaus is our most popular choice for Danish merchants — it offers fast approval, competitive pricing, and a streamlined application process. You can apply directly through OnPay by filling in the instant flow form.
Once you submit the application, Clearhaus provides an API key immediately so you can start accepting payments. However, payouts to your bank account won't begin until you complete the full registration process — this usually takes 2-3 business days.
Step 3: Connect your shop
Link your webshop to OnPay so customers can pay at checkout. This setup happens on your webshop platform. Depending on your platform, you'll either install a plugin, add your OnPay credentials (like Gateway ID and API keys), or use our API for custom integrations.
Setup typically takes just a few minutes.
Step 4: Test & go live
Dashboard → Settings → General Settings
Before accepting real payments, test your connection. Make sure you're in Test mode (Dashboard → Settings → General Settings), then complete a test purchase on your shop using our test cards. Once the test payment appears in your OnPay dashboard, you'll know the connection works.
When you're ready to accept real payments, switch to Production mode in General Settings. Make a small test purchase with a real card to confirm everything flows correctly. Check that the transaction appears in your OnPay dashboard.
You're all set! Once you've completed these steps, you're ready to accept payments.
Want to offer more payment options?
Once your acquirer is set up, you can add payment methods like Apple Pay, Google Pay, PayPal or Klarna. These give your customers more ways to pay and can improve your conversion rate.
Learn about wallets and providers
Want to take it further?
Customize your payment window with your logo and brand colors — it makes checkout feel like part of your shop and builds customer trust.
Learn about payment window customization
Need help?
Contact your reseller for setup questions and technical support. They know your specific configuration and can troubleshoot faster.
Please note: When contacting support, mention your Gateway ID. This ID is unique to your OnPay account and is located at the bottom of the left menu in your dashboard.