beangulp-wise 0.1.0

beangulp importer for Wise balance statements (statement.json), with a thin SCA-capable API client: idempotent drafts via referenceNumber, conversion-leg merging, fee splitting, closing-balance assertions

beangulp-wise

beangulp importer for Wise (formerly TransferWise) balance statements, plus a thin, SCA-capable API client to fetch them.

Wise has no official Python SDK, and the community clients are either experimental or AGPL-licensed; the import workflow needs exactly three GET endpoints, so this package owns a ~100-line client instead (beangulp_wise.client.WiseClient).

Design

The importer consumes statement.json files (one per currency balance), not the API directly — fetching writes files to disk first, so every import is auditable, replayable, and testable offline.

• referenceNumber (CARD-…, TRANSFER-…, CONVERSION-…) is stored as wise_id: metadata and is the idempotency key: extract() skips references already anywhere in the existing ledger. Re-imports are always safe.
• Payee by detail type: merchant name for card payments, recipient/sender for transfers, description otherwise.
• totalFees becomes an explicit posting to fees_account — fees stay visible instead of dissolving into the counter leg.
• payee_rules ((regex, account, flag)) draft the counter leg; unmatched entries keep the ! review flag and the cash leg only.
• endOfStatementBalance → a balance assertion the day after the interval.
• Conversions: each leg appears in a different currency's statement, sharing one referenceNumber. merge_conversions(entries) joins them into a single two-currency transaction — the incoming leg priced @@ what left the other balance net of fees, so it balances exactly.

Usage

from beangulp_wise import Importer, merge_conversions

importer = Importer(
    {"EUR": "Assets:Wise:EUR", "USD": "Assets:Wise:USD"},
    fees_account="Expenses:BankFees:Wise",
    holder="My GmbH",                       # a token may see several profiles
    payee_rules=((r"cloudflare", "Expenses:IT:Hosting", "!"),),
)
entries = merge_conversions(
    importer.extract("statement-eur.json", existing=ledger_entries)
    + importer.extract("statement-usd.json", existing=ledger_entries)
)

Fetching statements (SCA)

Statement endpoints are protected by Strong Customer Authentication: Wise answers 403 with a one-time token in the x-2fa-approval header, which must be signed (RSA-SHA256, PKCS#1 v1.5) with a private key whose public half is registered on the Wise account (Settings → API tokens → Manage public keys).

from beangulp_wise import WiseClient

client = WiseClient(token, private_key_pem=open("private.pem", "rb").read())
pid = client.profile_id("My GmbH")
for balance in client.balances(pid):
    statement = client.balance_statement(
        pid, balance["id"], balance["currency"],
        "2026-07-01T00:00:00.000Z", "2026-07-31T23:59:59.999Z",
    )

cryptography is an optional dependency (beangulp-wise[sca]) — importing statement files works without it.