Heymarket offers a full featured API and is used by lots of companies to build integrated workflows.
You can find details on the API at https://heymarket.docs.apiary.io
To get your API key, you need to be logged in to Heymarket web app. Follow the instructions on this page https://app.heymarket.com/admin/integrations/api to get the API key.
Heymarket also supports Webhooks for actions like Message Sent and Chat Assignment.
Please contact Heymarket support for more details on the Webhook or the API.
We are excited to see what you build!