feat(docs): private fpc guide#22497
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## Summary - Adds a new guide (`how_to_use_private_fee_juice.md`) explaining how fully private fee payment works on Aztec, using DeFi Wonderland's community-built `PrivateFPC` as a concrete example - Updates the fee payment overview (`how_to_pay_fees.md`) with a Private FPC row in the comparison table and a section linking to the new guide - Adds a paragraph to the foundational fees concept page (`foundational-topics/fees.md`) introducing private FPCs - Adds a user-facing section to the participant fees page (`docs-participate/basics/fees.md`) explaining private fee payment and shared anonymity sets - Adds `indistinguishability` to the spellcheck dictionary ## Test plan - [ ] Run `yarn start` in `docs/` and verify the new page renders at `/developers/aztec-js/how_to_use_private_fee_juice` - [ ] Verify all internal links resolve (from `how_to_pay_fees.md`, `fees.md` concept page, and participant `fees.md`) - [ ] Verify external links to `defi-wonderland/aztec-fee-payment` repo are valid - [ ] Run `yarn spellcheck` and confirm no new errors Co-authored-by: Esau <esau@aztec-labs.com> Co-authored-by: critesjosh <jc@joshcrites.com>
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## Summary Backport of #22497 to v4-next. Cherry-pick had a minor conflict in `docs/docs-words.txt` (the `indistinguishability` word addition conflicted with unrelated changes in the spelling dictionary). Resolved by accepting the incoming word. ### Changes - Adds `how_to_use_private_fee_juice.md` guide explaining fully private fee payment using DeFi Wonderland's PrivateFPC - Updates fee payment overview with Private FPC row in comparison table - Adds private FPC paragraphs to foundational fees concept page and participant fees page - Adds `indistinguishability` to spellcheck dictionary ### Commits 1. Cherry-pick with conflict markers preserved 2. Conflict resolution in docs-words.txt ClaudeBox log: https://claudebox.work/s/422d20244c5c0f73?run=1
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Apr 22, 2026
Ports changes from #22496 (Nethermind FPC docs) and #22497 (private FPC guide) to the v4.2.0 developer versioned docs, plus related updates to source docs (docs-developers), transaction phases explanation, and runnable TypeScript examples. Files: - developer_versioned_docs/version-v4.2.0: how_to_pay_fees.md, how_to_use_private_fee_juice.md, foundational-topics/fees.md, foundational-topics/transactions.md - docs-developers: how_to_pay_fees.md, how_to_use_private_fee_juice.md, foundational-topics/fees.md, foundational-topics/transactions.md - examples/ts: aztecjs_advanced/index.ts, aztecjs_connection/index.ts
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…#22541) ## Summary - Ports changes from AztecProtocol#22496 (Nethermind FPC docs) and AztecProtocol#22497 (private FPC guide) to the `v4.2.0-aztecnr-rc.2` developer versioned docs - Updates `how_to_pay_fees.md` with new payment methods table, deprecation notice, third-party FPC section (Nethermind example), and private fee payment section - Updates `fees.md` (foundational topics) with expanded FPC payment methods description, new "How FPCs work" section, and teardown phase clarification - Updates `how_to_create_account.md` anchor links to match renamed heading - Adds new `how_to_use_private_fee_juice.md` guide (DeFi Wonderland's PrivateFPC) ## Test plan - [ ] `yarn start` in `docs/` — verify versioned pages render correctly - [ ] Confirm internal links resolve (anchors to `#sponsored-fpc-devnet-and-local-only`, `#third-party-fpcs-on-testnet-and-mainnet`, `#how-fpcs-work`, and the new private FPC guide) - [ ] Verify external links to Nethermind and Wonderland repos are valid
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Summary
how_to_use_private_fee_juice.md) explaining how fully private fee payment works on Aztec, using DeFi Wonderland's community-builtPrivateFPCas a concrete examplehow_to_pay_fees.md) with a Private FPC row in the comparison table and a section linking to the new guidefoundational-topics/fees.md) introducing private FPCsdocs-participate/basics/fees.md) explaining private fee payment and shared anonymity setsindistinguishabilityto the spellcheck dictionaryTest plan
yarn startindocs/and verify the new page renders at/developers/aztec-js/how_to_use_private_fee_juicehow_to_pay_fees.md,fees.mdconcept page, and participantfees.md)defi-wonderland/aztec-fee-paymentrepo are validyarn spellcheckand confirm no new errors