Designing APIs using System, Process, and Experience Layers12% of the exam
Business Processes Across API Layers
Decompose a business process into reusable responsibilities, preserve dependencies between calls, and avoid extra application hops that add no business value. Use the documented simplification guidance to review the resulting design.
Identify appropriate APIs to implement a business process and assign them to layers of API-led connectivity.
~7 min read · 8 practice questions
What the exam expects
- Decompose business outcomes into existing and missing capabilities.
- Assign orchestration, channel adaptation and backend access deliberately.
- Preserve dependencies between calls when one result supplies another request.
- Choose reusable deployment boundaries without multiplying unnecessary hops.
A business process coordinates activities toward an outcome; orchestration controls their execution; a Process API exposes business composition; a System API provides backend access; an Experience API adapts capabilities for consumers.
Key facts
Process automation
- Detail
- Human tasks, rules and API calls can coexist in a BPMS.
- Source
- BPM (opens in a new tab)
Existing capability
- Detail
- Reuse an interface whose contract fits the activity.
- Source
- BPM (opens in a new tab)
Missing capability
- Detail
- Build and publish the missing interface rather than duplicate existing capabilities.
- Source
- BPM (opens in a new tab)
Process reuse
- Detail
- The automated process can itself expose an API.
- Source
- BPM (opens in a new tab)
Dependent calls
- Detail
- Obtain a required identifier before the operation that needs it.
Channel count
- Detail
- Shared consumer requirements can support a shared Experience interface.
Processing models
- Detail
- Show both batch and interactive information flows in the network.
Shared code
- Detail
- A library of subflows can avoid an unnecessary remote helper boundary.
Scaffold cleanup
- Detail
- Manual handler removal leaves the specification unchanged.
Health scope
- Detail
- Removing downstream checks narrows what a ping establishes.
- Why would re-scaffolding undermine the documented manual removal of unused APIkit handlers?
- When an initial network picture is useful but reuse estimates remain uncertain, what does the blueprint guidance prioritize?
- When applying the documented manual handler cleanup, which file normally contains the flows being removed?
The questions are free to read. Answers with their sources and self-grading are included with the pack.
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