Tax Rate Audit

Purpose

Enumerate all WooCommerce tax rates across every tax class and country, identify duplicate rates for the same country/class combination, and flag missing rates for countries where you have customers. Read-only.

Prerequisites

• WooCommerce store with REST API enabled
• Consumer Key with Read scope
• Minimum WooCommerce version: 3.5.0

Parameters

Authentication

WooCommerce uses OAuth 1.0a for HTTP and Basic Auth over HTTPS.

For HTTPS stores (recommended):

Authorization: Basic base64(consumer_key:consumer_secret)

For HTTP stores (development only): Use OAuth 1.0a — include oauth_consumer_key, oauth_nonce, oauth_signature, oauth_signature_method=HMAC-SHA1, oauth_timestamp, oauth_version=1.0

Never log or output consumer_key or consumer_secret values.

See docs/AUTHENTICATION.md for full setup instructions.

Safety

Read-only skill — no mutations are executed. Safe to run at any time.

Workflow Steps

Step 1 — Fetch tax classes

GET /wp-json/wc/v3/taxes/classes

Returns array of { slug, name }. Standard classes: standard, reduced-rate, zero-rate.

Step 2 — Fetch all tax rates per class

For each class slug:

GET /wp-json/wc/v3/taxes?class=<slug>&per_page=100&page=1

Extract: id, country, state, rate, name, priority, compound, shipping, class.

Step 3 — Detect duplicates

Group rates by (class, country, state). Flag groups with count > 1 as duplicates.

Step 4 — Export

API Endpoints Used

GET  /wp-json/wc/v3/taxes/classes   — list all tax classes
GET  /wp-json/wc/v3/taxes           — rates per class

Pagination Strategy

WooCommerce REST API uses page/per_page pagination (not cursor-based).

Standard pattern:

page = 1
while True:
  response = GET /endpoint?per_page=100&page=page
  process(response)
  if len(response) < 100: break
  page += 1

Maximum per_page is 100 for most endpoints. The X-WP-Total and X-WP-TotalPages response headers report totals. Always read X-WP-TotalPages on the first request to estimate job size.

Session Tracking

Claude MUST emit the following output at each stage. This is mandatory.

STARTUP:

╔══════════════════════════════════════════╗
║  SKILL: woo-tax-rate-audit               ║
║  STORE: <store_url>                      ║
║  TIME:  <ISO-8601 UTC>                   ║
║  MODE:  READ-ONLY                        ║
╚══════════════════════════════════════════╝

PER-OPERATION (emit after each API call batch):

[N/TOTAL] <METHOD> <endpoint> → <result_count> records | params: <key>=<val>

COMPLETION (human format):

╔══════════════════════════════════════════╗
║  COMPLETE: woo-tax-rate-audit            ║
║  RECORDS PROCESSED: <n>                  ║
║  OUTPUT: <filename>                      ║
╚══════════════════════════════════════════╝

COMPLETION (json format):

{
  "skill": "woo-tax-rate-audit",
  "store": "<store_url>",
  "completed_at": "<ISO-8601>",
  "records_processed": <n>,
  "output_file": "<path>",
  "dry_run": false
}

Output Format

CSV filename: woo-tax-rate-audit_<YYYY-MM-DD>.csv Columns: tax_id, class, country, state, rate_pct, name, priority, compound, applies_to_shipping, duplicate_flag

Error Handling

Best Practices

• Duplicate rates for the same country+class can cause double taxation — resolve by removing lower-priority entries.
• Verify applies_to_shipping = true for standard rates in jurisdictions that tax shipping.
• Cross-reference against /reports/taxes after a period close to confirm rates are collecting as expected.