Bizagi offers an integration layer which allows you to integrate existing corporate systems (such as ERP, CRM, core applications, legacy systems and services in the ESB in general), in your Bizagi BPMS solution by means of diverse alternatives.
One of the most outstanding alternatives to invoke external services from your Bizagi processes, is Bizagi Connectors.
Through Bizagi connectors you may easily approach B2B integration scenarios, and rely on powerful features to connect to other systems and applications, especially to those using a modern architecture (i.e, typically those providing cloud services through a RESTful API).
Please contact me before for more details.