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CartModules: Swish Payment Gateway
Accept Swish payments in your CS-Cart store. Swish is Sweden's leading mobile payment service with over 9 million active users. Let your Swedish customers pay instantly using the Swish app on their smartphones.Why Swish?
- 9+ million users -- Swish is used by the vast majority of Sweden's adult population
- Instant payments -- Funds are transferred in real-time via Bankgirot
- High conversion -- Familiar, trusted payment method for Swedish shoppers
- Low friction -- Customers approve payments with a single tap in their app
- Low fees -- Competitive merchant fees compared to card payments
Key Features
Swish E-commerce API v2
Built on the latest Swish for Merchants API with full e-commerce flow support. Creates payment requests that trigger push notifications to customers.
mTLS Security
Uses mutual TLS (client certificate) authentication as required by Swish. Your certificate credentials never leave your server.
Async Callbacks
Server-to-server callbacks ensure reliable payment status updates even if the customer closes their browser.
Sandbox Support
Full sandbox/test mode support. Develop and test your integration before going live using Swish test certificates.
Status Mapping
Configure which CS-Cart order status maps to each Swish payment outcome (PAID, DECLINED, ERROR, CANCELLED).
Idempotent Processing
Duplicate callbacks are handled gracefully. Already-processed orders are never re-processed, preventing double charges.
How It Works
- Customer selects Swish at checkout and confirms the order.
- Your store creates a payment request via the Swish API.
- Customer receives a push notification in their Swish app.
- Customer opens Swish, reviews the payment details, and approves.
- Swish sends a server callback confirming the payment status.
- Your store automatically updates the order to Processed.
Requirements
| Requirement | Details |
|---|---|
| CS-Cart Version | 4.x (ROOT, ULTIMATE, or Multi-Vendor edition) |
| PHP Version | 7.1 or later |
| Swish Agreement | Swish for Merchants (E-commerce) agreement with a Swedish bank |
| Client Certificate | .p12 or .pem certificate issued by Swish / your bank |
| Server | OpenSSL and cURL with TLS 1.2+ support |
| Currency | SEK (Swedish Krona) must be configured in your store |
| Callback Access | Your store must be reachable from external servers (Swish callbacks) |
Configuration
| Setting | Description |
|---|---|
| Payment Mode | Switch between Live and Test (Sandbox) environments |
| Merchant Swish Number | Your 10-digit Swish number (e.g. 1234679304) |
| Certificate Path | Absolute server path to the client certificate file |
| Certificate Password | Passphrase for the certificate (if applicable) |
| Order Status Mapping | Customizable CS-Cart status for each Swish outcome (PAID, DECLINED, ERROR, CANCELLED) |
Installation
- Go to Add-ons > Manage add-ons, click Manual installation, and upload the addon zip
- Activate the addon and enter the license key
- Go to Administration > Payment methods and create a new payment method with the Swish processor.
- Enter your Swish merchant number, certificate path, and passphrase.
- Test using sandbox mode, then switch to live when ready.
Security
- All API communication uses TLS 1.2+ with mutual TLS (client certificate authentication).
- SSL peer verification is always enabled -- never disabled.
- Certificate paths and passwords are never logged in plain text.
- No customer card data is handled (PCI SAQ A compliant).
- All database queries use parameterized placeholders.
- All user input is type-cast and sanitized.
- Callbacks are idempotent -- duplicate notifications are handled safely.
Payment type
One-time payment
Product
- Store Builder
- Store Builder Ultimate
- Multi-Vendor
- Multi-Vendor Plus
- Multi-Vendor Ultimate
Compatible versions
- 4.20.1
- 4.19.1.SP2
- 4.19.1.SP1
- 4.19.1
- 4.18.4
- 4.18.3
- 4.18.2.SP1
- 4.18.2
- 4.18.1.SP1
- 4.18.1
- 4.17.2.SP3
- 4.17.2.SP2
- 4.17.2.SP1
- 4.17.2
- 4.17.1
- 4.16.2
- 4.16.1
- 4.15.2
- 4.15.1.SP4
- 4.15.1.SP3
- 4.15.1.SP2
- 4.15.1.SP1
- 4.15.1
- 4.14.3
- 4.14.2.SP1
- 4.14.2
- 4.14.1.SP1
- 4.14.1
- 4.13.3
- 4.13.2.SP2
- 4.13.2.SP1
- 4.13.2
- 4.13.1
- 4.12.2
- 4.12.1
- 4.11.5
- 4.11.4
- 4.11.3
- 4.11.2
- 4.11.1
- 4.10.4.SP1
- 4.10.4
- 4.10.3
- 4.10.2
- 4.10.1
- 4.9.3
- 4.9.2
- 4.9.1
- 4.8.2
- 4.7.4
- 4.6.3
Localizations
- English
Contact information
Email
Phone
+91-96538-49089
Website
CartModules is an authorised CS-Cart reseller in India and a CS-Cart development specialist since 2014. We have delivered 250+ projects for businesses in 20+ countries and publish 125+ solutions on the CS-Cart Marketplace, all developed and maintained in-house.
What we are known for
Integrations. We help merchants connect CS-Cart with the platforms and services they already use.
Marketplace Connectors. Connect CS-Cart Multi-Vendor with Shopify, WooCommerce, Wix, PrestaShop, Shopware 6, Squarespace, Square and Ecwid through individual connectors, all managed from one place with Shop Connector Manager.
Payments. 90 payment gateway add-ons covering regional methods and buy-now-pay-later, including Tabby, Tamara, Afterpay, Sezzle, Affirm, Almapay, Takbull, Windcave, aamarPay and Atmos.
Shipping. 14 shipping integrations including ShipStation, Shippo, Smart Shipping & Fulfillment Manager, Aramex, DTDC, Ekart, Shiprocket, Safexpress, UPS and Purolator.
Search and AI. Algolia AI Instant Search and AI Store Copilot.
What we do
- CS-Cart Store and Multi-Vendor Marketplace Development
- Custom Add-on Development
- Third-Party API and Service Integrations
- Marketplace Connectors
- Multi-Store Development
- CS-Cart Version Upgrades
- Migration to CS-Cart
- Custom Themes and UI/UX Development
- Mobile App Development
- Payment and Shipping Integrations
- Server Support, Maintenance and Performance Optimization
Support
Every CartModules add-on is maintained by the team that developed it, so technical support and updates come directly from us. We also offer a 30-day money-back guarantee on every CartModules add-on.
Need a custom CS-Cart solution?
sales@cartmodules.com
 | +91 96538 49089
 | cartmodules.com
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