Add comprehensive implementation guide for creating PlanAction claims
via hydratePlan() function pattern, following established hydrateGive()
and hydrateOffer() patterns.
Changes:
- Add hydrate-plan-implementation-guide.md with complete implementation
details, usage examples, and testing recommendations
- Link implementation guide from getting-valid-plan-ids.md Method 6
- Link implementation guide from localhost-testing-guide.md Option B
The guide provides:
- Complete hydratePlan() function implementation
- PlanActionClaim interface structure
- Helper functions (createAndSubmitPlan, editAndSubmitPlan)
- Usage examples and edge cases
- Testing recommendations and security considerations
This complements plan creation documentation by showing how to
programmatically construct valid PlanAction JWTs for POST /api/v2/claim.
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