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Invoice OCR API for AP Intake, Validation, and ERP Sync

Implement an invoice OCR API workflow that captures email attachments, validates extracted finance fields, and routes accepted records into ERP systems.

Use this route when AP intake starts in email and the downstream system expects structured, validated invoice records.

What an invoice OCR workflow must do well

OCR alone is not enough for AP workflows. The workflow must:

  1. capture invoice attachments from inbound email reliably
  2. extract the fields finance systems actually need
  3. validate those fields before downstream write
  4. route uncertain records into review instead of auto-posting
  5. preserve an audit trace for accepted, held, and rejected records

Which fields must be trusted before posting?

At minimum, validate these fields before an ERP sync or accounting handoff:

  1. supplier identity
  2. invoice number uniqueness
  3. currency and amount consistency
  4. tax and due-date correctness
  5. purchase-order linkage, if required

Validation policy tiers

Tier Condition Workflow action
auto-accept all required fields validated and confidence above threshold post to ERP queue
review-required required fields present but confidence mixed route to AP review
reject/hold missing key identifiers or validation failure hold and notify vendor-ops lane

Finance-safe workflow

  1. ingest invoice attachments from inbound email.
  2. extract header and line-item data via OCR and parser pipeline.
  3. run accounting validation rules (totals, tax, duplicates, PO checks).
  4. route by policy tier.
  5. sync accepted invoices to ERP and persist audit trace.

How MailSlurp helps

MailSlurp leads when the invoice workflow starts with email:

Duplicate and fraud controls

  • enforce unique key strategy (supplier + invoice number + amount).
  • flag sudden vendor bank/account changes for manual verification.
  • quarantine malformed or suspicious attachments before extraction.

Operational metrics

  • first-pass auto-accept rate
  • review queue aging and SLA breach rate
  • duplicate invoice detection rate
  • ERP post success vs extraction success delta