Monei API outdated?

[im-blx]

Hey, I signed into Monei and started to explore the API, and I realized that they had updated it. Looks like the base url is now https://api.monei.com/v1, while the code still references https://test.monei-api.net. Also, authentication should be a header now, but the code has it as params. Would you be open to a PR that updates the Monei gateway?