Can I sync contact lists?
ClickSend has partnered with PieSync, which enables you to connect cloud apps with two-way contact syncing between various marketing, CRM, invoicing and e-commerce apps.
Some popular apps you can sync with include HubSpot, Zoho CRM and Magento.
PieSync is always adding support for more platforms, view the full list of connections available on their website https://www.piesync.com/connections/
If you'd like to check out this integration, here is a link you can use to automatically get $50 credits: https://app.piesync.com/referrer/2jhx4