Add LSP opening fee to LspInvoiceResponse#683
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Include the LSP's JIT channel opening fee in the lsp_invoice response so clients can display the negotiated fees when presenting an invoice. The fee is computed from the selected LSP's LSPS2 fee parameters using max(min_fee_msat, ceil(amount * proportional / 1_000_000)). When the node has sufficient incoming capacity and no JIT channel is needed, the fee is reported as 0. Also surfaces the fee through gl-sdk's ReceiveResponse for UniFFI bindings consumers. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
opening_fee_msatfield toLspInvoiceResponseprotobuf messagemax(min_fee_msat, ceil(amount * proportional / 1_000_000))gl-sdk'sReceiveResponsefor UniFFI bindings consumers (Kotlin/Swift/Python)This allows clients (e.g., Breez SDK) to display the negotiated LSP fees when presenting an invoice to the user.
Test plan
test_lsps_plugin_callsupdated and passing — verifiesopening_fee_msat == 1000for a 31337 msat invoice with LSPS2 policymin_fee_msat=1000, proportional=1000🤖 Generated with Claude Code