InterKassa Payment Gateway

About Interkassa

Interkassa is an Eastern European payment aggregator supporting cards and 100+ payment methods.

What Interkassa supports

Cards and local methods for Ukraine and CIS via the Interkassa SCI.

• Payment methods: Cards, wallets, 100+ methods
• Where it works: Ukraine and Eastern Europe
• Billing: one-off payments
• Price: free for every PremiumPress member

Setting up Interkassa in PremiumPress

Activate the free plugin, then open your theme’s payment settings and add your Interkassa credentials:

• Checkout ID — The Checkout (кассы) ID — ik_co_id.
• Secret key — The checkout’s signing secret. Set the checkout’s Interaction (webhook) URL

One-time payments. Amounts are sent with 2 decimal places. Recurring is not supported by the Interkassa SCI in this flow. The plugin requires PremiumPress 12.

Interkassa plugin FAQ

What do I need to set up Interkassa in WordPress?

You'll need a Interkassa account and its Checkout ID and Secret key, which you enter in your PremiumPress theme's payment settings. The plugin itself is free for members.

Does Interkassa support recurring subscriptions?

Interkassa handles one-off payments in PremiumPress. If you need recurring billing, choose a gateway shown under the Subscriptions filter on the plugins page.

How does the Interkassa checkout work?

A signed auto-POST to the Interkassa SCI hosted checkout, with the signed interaction (webhook) and return verified. One-time payments, no SDK.