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Business Process Model and Notation (BPMN) is a widely adopted standard for modeling business processes across various domains. BPMN, particularly starting from version 2.0, provides extensibility through custom elements. Existing research demonstrates that domain-specific extensions have been developed to address gaps in representing specialized processes, such as IT security, healthcare workflows, manufacturing, e.t.c. However, in the context of financial workflows, there is a lack of systematic approaches to adequately represent payment processes. BPMN often simplifies payment steps and their side effects as generic activities or simply using boundary error events for failed payment transactions. This overlooks critical domain-specific details, especially when the business process involves money being sent from one party to another. With the increasing adoption of blockchain for executing financial workflows, traditional ways of modeling payment tasks in BPMN prove inadequate for capturing the complexity of financial primitives and the joint atomicity of payment and workflow steps. To address these limitations, we leverage the extensibility offered by BPMN and propose an approach to modeling complex payment steps, incorporating additional concepts and symbols to represent key payment attributes to better accommodate domain-specific characteristics of financial workflows.
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