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+
+> Mirrored from `/mnt/DATA/git/mousehold/docs/connectors.md`.
+> Origin: `repository`.
+> Active tasks and changing state belong in Gitea issues; this wiki page is durable project context.
+
+---
+# Connector Boundary
+
+Mousehold treats connectors as evidence producers. A connector submits `RawObservation`
+payloads; the backend turns them into reviewable `FinancialEvent` candidates and links
+the source evidence.
+
+## Local-First Rule
+
+Bank and mailbox credentials should stay in the local agent where possible.
+The API stores:
+
+- connection type and display name
+- owner user and household
+- sync status and last error
+- a local secret reference, not the secret itself
+- normalized observations
+
+## Current PoC Routes
+
+- Manual entry: `POST /observations/manual`
+- Generic normalized import: `POST /observations/import`
+- Local-agent batch sync: `POST /observations/sync`
+- Connector metadata: `POST /connections`
+- Local-agent registration: `POST /local-agent/register`
+- Browser IMAP folder listing: `POST /agent/imap/folders`
+- Browser IMAP scan: `POST /agent/imap/scan`
+- PayPal CSV statement parsing: `POST /agent/paypal/statement/parse`
+- Klarna CSV statement parsing: `POST /agent/klarna/statement/parse`
+
+## Data Source Mapping
+
+- Bank CSV, FinTS, PSD2: confirmed cash movement observations. FinTS fetching is implemented in the local agent.
+- PayPal CSV: confirmed PayPal account observations.
+- PayPal email: announced or outstanding purchase/payment evidence.
+- Klarna email: usually outstanding obligation evidence.
+- Order confirmation email: announced purchase evidence.
+
+Bank debits that fund PayPal, Klarna, or cards should be linked as settlements or
+liability payments instead of duplicated as new expenses.
+
+## Reconciliation
+
+The reconciliation service computes reviewable suggestions from imported events
+instead of linking automatically. Current suggestions cover:
+
+- PayPal/Klarna/order email evidence matched to PayPal or Klarna statement rows
+- PayPal/Klarna statement rows matched to FinTS, bank CSV, or PSD2 cash movement
+- exact amount/currency matches with date windows, party overlap, provider names,
+  and shared references
+
+Accepting a suggestion creates an event relation, attaches the confirming
+observation to the primary event as evidence, and upgrades the primary event to
+`confirmed` when the confirming event is confirmed. The confirming event is kept
+for auditability; later UI cleanup can decide how aggressively to collapse or
+hide duplicate-looking rows.
+
+## IMAP Flow
+
+The web app has a `Mail` panel for IMAP proof-of-concept imports. It sends IMAP
+credentials to the configured agent route for that request only, selects the
+requested folder read-only, scans recent messages, and returns previews plus
+normalized observations. The backend stores observations only after the user
+clicks import.
+
+The parser currently recognizes EUR amounts, simple due-date phrases, Klarna
+references, PayPal transaction IDs, order numbers, and invoice numbers. Email
+evidence is classified as `announced` unless it is a Klarna or due-date driven
+promised payment, which becomes `outstanding`. Confirmed cash movement should
+still come from FinTS, bank CSV, PSD2, or PayPal/Klarna statement CSV.
+
+## PayPal Statement Flow
+
+The active PayPal path is statement and email based.
+
+The `Statements` panel supports PayPal Activity Download CSV exports. It
+recognizes fields such as `Date`, `Name`, `Type`, `Status`, `Currency`, `Gross`,
+`Fee`, `Net`, and `Transaction ID`, then imports confirmed `paypal_csv`
+observations.
+
+PayPal emails remain early evidence for announced or outstanding obligations.
+Later PayPal statements and bank debits should confirm or settle those events
+instead of creating duplicate household expenses.
+
+## Klarna Statement Flow
+
+The `Statements` panel also supports Klarna CSV. It handles Klarna Merchant
+settlement reports with a summary section followed by a `type`/`amount`
+transaction table, and a simpler consumer-style CSV with date, description,
+amount, currency, reference, and type columns. Klarna CSV observations use
+`source_type=klarna_csv` and are treated as confirmed statement evidence, while
+Klarna emails remain the early outstanding/announced signal.