Integration design patterns for integration Workday HCM - SAP Concur

I have a business requirement to transform the business processes which are currently manual and require human interventions to automated using automation platform.

  • We have chosen Camunda as our BPaaS (Business Process as a Service) platform, for the primary reason of making organisation go towards Event driven + SOA (Service Oriented Architecture).

Challenge I have are related to adopting integration pattern:

  1. Although Workday has enhanced web services to support real time integration, but i have no idea how it can effectively integrate with SAP Concur for bi directional data integration.

I am looking for any reference (in the form of low level design or architecture) which is proven