Kontakte per Massenimport in Systeme.io über die HTTP-API importieren

### Use this to add many contacts at once 👉 Adding thousands of contacts can be tricky, specially if you have many fields to add. This node is an alternative to the native import functionality from Systeme.io. If you need some custom data added to your leads, maybe using the API will be better than using the import tool they provide in Systeme.