Commercetools
Advanced
API Extensions for Synchronous Business Logic
Design API Extensions for validation and mutation without making every cart update depend on slow enterprise services.
55 min
3 sections
api-extensions
synchronous
validation
1
2
3
01. Know the blast radius
Section 1 of 3
API Extensions are called after a create or update request is processed but before the result is persisted. They can validate or apply additional update actions. Because they sit inside the write path, their latency and failures directly affect the original API call.
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API Extension fit:
Good:
- validate purchase order policy
- enforce restricted goods shipping rule
- attach derived compliance custom field
Risky:
- call three slow enterprise systems
- run fraud machine learning synchronously on every cart update
- perform long-running OMS allocation
- send email or analytics eventsBack to Course