PASAR API

🇩🇪 Unzer ~ online payments & checkout API

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German (Heidelberg) payment provider, formerly Heidelpay; public sandbox keys and SDKs, live use requires a merchant contract.

View docs ↗ More Payments APIs

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# Unzer ~ online payments & checkout API needs an API key ~ get yours at:
# https://docs.unzer.com/
curl 'https://api.unzer.com/v1/' \
  -H 'Authorization: Bearer YOUR_TOKEN'

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I'm integrating a Germany API into my app.

API: Unzer ~ online payments & checkout API
Provider: Unzer GmbH
Auth: requires an API key (sign up: https://docs.unzer.com/)
Pricing: paid
Base URL: https://api.unzer.com/v1/
Important note: German (Heidelberg) payment provider, formerly Heidelpay; public sandbox keys and SDKs, live use requires a merchant contract.

Source: Unzer GmbH (https://docs.unzer.com/)
Source type: Provider API or developer docs
Endpoint type: Provider API base URL
Integration difficulty: Needs API key
Last checked: 2026-07-05
Production caveat: Keep credentials server-side and confirm current limits, pricing, and webhook/error behaviour in the provider docs.

Help me set up the correct onboarding/authentication path and make the first valid request ~ explain exactly where credentials go and what must happen before production.

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