Testing - Kalixo Developers

The sandbox (https://sandbox.checkout.kalixo.io) behaves like live but never moves money. Use your kc_sk_test_ and kc_pk_test_ keys.

Test cards

Enter any future expiry date and any CVC.

Card number	Result
`4111 1111 1111 1111`	Authorised
`4000 0000 0000 0002`	Declined (`generic_decline`)
`4000 0000 0000 9995`	Declined (`insufficient_funds`)
`4000 0000 0000 3220`	3D Secure challenge; approve or decline in the test dialog
`4000 0000 0000 0077`	Pending; the outcome arrives by webhook only
`4000 0000 0000 0119`	Processing error
`4000 0000 0000 0101`	The provider reports a different amount: triggers `payment.amount_mismatch` and an automatic reversal

Refunds of exactly 666 minor units fail (refund.failed).

Kalixo may route your sandbox account to a provider’s test environment instead. The checkout then shows that provider’s test form and test cards; your integration does not change.

What to test before going live

Successful payment and fulfilment on payment.captured.
Declined payment and retry on the same session.
Pending payment that completes by webhook only.
Webhook signature verification and duplicate deliveries (deduplicate on id).
Amount mismatch handling (do not fulfil when amount_mismatch is true).
Full and partial refunds.