Email Parsing API Checklist for E-commerce

List all senders and templates that drive operations, including storefront order confirmations, marketplace vendor notices, carrier updates, invoices, and return requests. Capture sender domains, subjects, frequencies, and required SLAs for each email class.

Create a normalized JSON model for OrderCreated, OrderUpdated, ShipmentCreated, and ReturnRequested events with fields like order_id, sku, variant, taxes, discounts, and tracking_numbers. Keep a schema registry so each parser maps to one source of truth.

Use webhooks for near-real-time order creation and returns routing to fulfillment within minutes. Reserve REST polling for backfills, lower-priority vendor updates, or maintenance windows where inbound delivery is paused.

Select a stable dedupe key per event type, such as RFC Message-Id plus vendor order number for orders, or RMA number for returns. Persist processed keys to avoid duplicate shipments or refunds.

Identify personal data like names, emails, phone numbers, and addresses in parsed payloads. Define redaction, encryption at rest, and data retention periods aligned with GDPR and PCI-DSS adjacent practices.

Tackle top-ten vendor templates that drive 80 percent of orders before long-tail integrations. Sequence rollouts around peak events like launches and holiday sales to reduce risk.

Define parse-to-webhook SLAs, for example 60 seconds for order confirmations, 5 minutes for returns, and 15 minutes for invoices. Tie alerts to SLA breaches to protect fulfillment timelines.

Create vendor-specific aliases like vendorname.orders@ingest.yourdomain.com for higher signal routing and simplified parser selection. Rotate addresses when vendors change templates.

Require TLS for SMTP delivery and verify SPF/DKIM alignment before accepting mail to reduce spoofing. Reject failing messages or quarantine for manual review.

Leverage tags like orders+us@ingest.yourdomain.com or orders+store42@ingest.yourdomain.com. Pass the tag value through to parsed JSON for downstream routing rules.

Route carrier updates to carriers@ingest.yourdomain.com and separate inboxes for customs or exception notices. Simplify carrier-specific parsers and SLAs.

Drop DSNs, out-of-office replies, and mailing list noise using header fields like Auto-Submitted and Precedence. Prevent noisy messages from triggering parsers.

Attach metadata to addresses indicating vendor name, template version, and contact person. This accelerates troubleshooting when templates drift.

Use the text/html part when available and anchor selectors to stable labels like 'Order #' or table headers. Fall back to text/plain parsing only when HTML is missing.

Select the best part by content-type priority, decode quoted-printable and base64, and parse PDFs only when HTML lacks structured data. Preserve original charset and convert to UTF-8.

Parse sku, variant, quantity, unit_price, taxes, discounts, and bundle relationships. Convert currencies to a canonical code and store raw and converted prices.

Normalize shipping and billing addresses to country-specific formats and validate postal codes. E.164-format phone numbers for consistent downstream usage.

Identify RMA numbers, refund amounts, and return reasons from subjects and body cues like 'Return initiated' or 'Refund processed'. Emit a ReturnRequested or RefundIssued event with references to original order_id.

Parse tracking numbers with carrier-specific regexes and map to carrier codes like UPS, USPS, DHL, and regional couriers. Include estimated delivery dates and service levels when present.

Convert all timestamps to ISO 8601 UTC while retaining the vendor's original timezone in metadata. Normalize decimal separators to dots and capture currency codes explicitly.

Validate an HMAC signature header using a shared secret and reject unsigned requests. Restrict inbound traffic to known IP ranges to prevent abuse.

Use event_id or a hash of Message-Id plus order_id to ensure at-least-once delivery does not create duplicates. Store processed IDs with a TTL to keep the set bounded.

Publish parsed JSON to Kafka, SQS, or RabbitMQ topics like orders.created and returns.requested. Decouple parsing from OMS, WMS, ERP, and support ticketing consumers.

Poll for new messages with pagination and ETags when webhooks are paused or endpoints are under maintenance. Implement exponential backoff and circuit breakers.

Map parsed fields to your OMS and ERP schemas, handling taxes, discounts, and multi-currency rules. Add source_email_id for traceability in every outbound call.

Throttle per-destination and batch low-priority updates to avoid API bursts during promotions. Keep high-priority orders on a fast lane queue.

Store webhook secrets and API tokens in a vault and rotate on a fixed schedule or incident. Automate key distribution to limit manual handling.

Collect at least ten real emails per top sender across order, shipment, and return scenarios. Include multilingual and promotional variants to catch template drift.

Assert selector extraction against immutable fixtures and fail builds on diffs. Version tests by sender and template revision.

Inject broken boundaries, mixed encodings, and unusual content-transfer encodings. Ensure parsers degrade gracefully and still emit minimal viable events.

Replay a day's worth of emails at Black Friday rates to validate throughput, queue sizing, and webhook handler latency. Verify SLAs for high-priority orders.

Track parse success rates and extraction completeness by sender and template version. Alert when metrics fall below thresholds to trigger parser updates.

Strip PII from logs while storing raw MIME for 30-90 days in encrypted storage for replay and audit. Link archives by source_email_id.

Document steps for webhook failures, parser regressions, and vendor template changes. Keep feature flags to quickly roll back to a prior parser version per sender.