[codex] Add public Paykit payments to contacts

[ben-kaufman]

Summary

• Add public Paykit payments for saved contacts and scanned/pasted Pubky contacts.
• Publish wallet payment endpoints from the Pay Contacts settings flow.
• Support Lightning, on-chain, and combined BIP21 contact payment requests using the existing send flow.
• Update Paykit endpoint IDs and bindings for paykit-rs v0.1.0-rc3.

Notes

• Pubky scan/paste opens the contact flow first; payment starts from the contact screen.
• On-chain endpoints are selected by priority: taproot, segwit, p2sh, then legacy.
• You can verify and see the endpoints published on https://payky.app

Validation

• swiftformat on touched Swift files
• git diff --check
• xcodebuild -resolvePackageDependencies -project Bitkit.xcodeproj
• Full app build was attempted, but still fails in existing vss-rust-client-ffi generated bindings.
• Translation validation was attempted, but the script currently needs the missing glob dependency.

[chatgpt-codex-connector]

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Reviewed commit: 3ea3f5832a

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[piotr-iohk]

Tested roughly against this plan. Tested against staging.

Areas tested and 🟢 for me (encountered issue #536, but seems unrelated to paykit).

• send/receive with imported pubky to saved/unsaved contact (onchain and lightning)
• send/receive with created pubky to saved/unsaved contact (onchain and lightning)
• RBF sent tx to concat
• CPFP on received tx from contact
• enable/disable payments with contacts

Some testing notes / observations:

• Enter manually is not supporting pubky (since we have it supported on paste/qr code scan etc. - then Send -> Enter manually should also support it)

---

• RBF-ed transaction not shown in profile activity (Instead there is a sent tx with Removed from Mempol note)
  • to reproduce:
  • send to contact and RBF transaction
  • see transactions in contact activity

[piotr-iohk]

LGTM, remaining obesrvations can be addressed separately, issue for tracking: #539

[ovitrif]

LGTM

Tested using same script like on Android counterpart ([codex] add public contact payments).

Focused on validating, besides happy flow, edge cases to ensure Public pay2contact payment methods are always up-to-date.

[ovitrif]

Validated fix in last commit for Payky 🎉

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 768c3d05a8

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• Mark a draft as ready
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[piotr-iohk]

I checked 2881537. It seems to only partially touch #539 (not sure if that was the intent): it filters replaced RBFd sent transactions from contact activity, so it removes the stale “Removed from Mempool” row, but it doesn't make the new replacement tx appear in contact activity - effectively RBFd tx does not appear in the activity at all. The manual Send -> Enter manually pubky routing is not addressed by this commit.

[pwltr]

Aside from things already mentioned I noted the following:

Missing or disabled UI (make sure this was left out of scope on purpose):

• Send -> Contact (select contact)
• ActivityRow: Contact image
• ActivityDetail: Assign contact, assigned contact UI
• Settings -> Payment Preference

Pay to contact (LN, iOS to iOS): For a new profile, when creating the first channel it publishes an invoice, but it does not seem to be payable (route not found). Only after a restart (receiver) can it be paid.

• Receiver: Create wallet, create Pubky w/ Bitkit
• Sender: Add Contact
• Sender: Send onchain
• Receiver: open channel
• Sender: Send LN -> route not found
• Receiver: restart app
• Sender: Send LN -> works

Simulator.Screen.Recording.-.iPhone.SE.3rd.generation.-.2026-05-06.at.12.59.39.mov

UI in general needs a lot of polishing, but out of scope for this PR.

[ovitrif]

Updated issue for polishing work 539 with @pwltr 's findings:

• Public payments polish #539

[ovitrif]

utAck, rechecked code changes.

We should merge and continue the #539 fixes in new PR(s). 🙏🏻