fix(samples): add required currency field to UMA address destinations

[claude]

Summary

• Fixes Kotlin sample app to include the required currency field when building UMA address destinations for quotes

This change is required because UmaAddressDestination.currency was changed from optional to required in commit 6883dfd.

Context

Recent OpenAPI schema changes (last 24 hours) included:

• railDetails added to transaction source/destination (commit 651d392)
• expiresAt added to ApiToken (commit 817fd89)
• BusinessInfo taxId and incorporatedOn made optional (commit b913836)
• UmaAddressDestination.currency made required (commit 6883dfd)

Documentation review found:

• Mintlify docs already properly document railDetails in transaction-lifecycle.mdx, receipts.mdx, and reconciliation.mdx
• Changelog already documents all four changes
• Grid Visualizer doesn't support UMA destinations (not affected)

Only the Kotlin sample needed updating.

Test plan

• Verified make build passes
• Verified make lint passes (0 errors)
• Manual review: UMA quote destination now requires currency in request body

🤖 Generated with Claude Code

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3 Skipped Deployments

Project	Deployment	Actions	Updated
grid-cards-demo	Ignored		Oct 7, 2026 8:24am UTC
grid-flow-builder	Ignored		Oct 7, 2026 8:24am UTC
grid-wallet-demo	Ignored		Oct 7, 2026 8:24am UTC

[greptile-apps]

Confidence Score: 5/5

[Low risk] Sample code adds a required field to a data structure.

This fix appears safe to merge.

What we checked:

• Account destinations stay unchanged: No. Only destinations with umaAddress reach the new line. Account destinations still use their separate builder.

Summary

The Kotlin sample now passes destination.currency when building an UMA quote destination.

• Matches the API’s required destination field.
• Leaves account destinations unchanged.
• No actionable issues found.

_{Reviews (1) · Last reviewed commit: "fix(samples): add required currency fiel..." · Reviewed by Greptile}