py-dgii-ecf

DGII e-CF electronic invoicing SDK for the Dominican Republic (Python).

Result-pattern (result), resilient HTTP (httpx2 + tenacity + pybreaker), and XMLDSig signing (lxml + cryptography). No hidden exceptions — every fallible call returns a Result.

Install

uv add py-dgii-ecf
# or
pip install py-dgii-ecf

Server-side only. Never load in a context that exposes private keys.

Quick start

from py_dgii_ecf import ECF, Environment, P12Reader, Signature

reader = P12Reader(password)
credentials = reader.get_key_from_file("/secure/identity.p12")
if credentials.is_err():
    raise SystemExit(credentials.unwrap_err())

ecf = ECF(credentials.unwrap(), Environment.CERT)
auth = ecf.authenticate()
if auth.is_err():
    raise SystemExit(auth.unwrap_err())

signature = Signature(credentials.unwrap().key, credentials.unwrap().cert)
signed = signature.sign_xml(xml)
if signed.is_err():
    raise SystemExit(signed.unwrap_err())

response = ecf.send_electronic_document(signed.unwrap(), "101672919E3100000001.xml")
response.map(lambda invoice: print(invoice.get("trackId"))).map_err(
    lambda error: print(error.code, error)
)

Result pattern

result = ecf.status_track_id("some-track-id")
if result.is_ok():
    print(result.unwrap().get("estado"))
else:
    error = result.unwrap_err()
    print(error.code, error.message)

Resilience & idempotency

• Transient failures (network, timeout, 408/429/5xx) are retried with exponential backoff and guarded by a pybreaker circuit breaker.
• send_electronic_document / send_summary are keyed by RNC + eNCF + SHA-256(signed XML). Provide a persistent IdempotencyStore in production.

ecf = ECF(credentials, Environment.PROD, idempotency_store=my_redis_store)

CLI

py-dgii-ecf sign invoice.xml identity.p12 --output signed.xml
py-dgii-ecf authenticate identity.p12 --environment CerteCF
py-dgii-ecf status <track-id> identity.p12 --environment CerteCF

Modules

environment, types, errors, result, resilience, http, certificate, signing, transformer, utils, client, cli.

License

MIT © 2026 Deuri Vasquez