For Legacy Integrations

Are you looking for documentations for old/legacy integrations using for example hashes? It can be found here: https://sveapayments.atlassian.net/wiki/spaces/DOCSLEGACY

From the aforementioned API documentation you can find information related to Legacy Integrations that are using hash authentication (instead of Basic Authentication) and where for example new payment data is sent by payer’s browser instead of web store’s server (server-to-server).