Coupon Discount Impact

Purpose

Aggregate the total discount value applied by each coupon code across WooCommerce orders in a specified date range. Quantifies revenue foregone per coupon, order attach rate, and average discount per use. 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 completed orders in range

GET /wp-json/wc/v3/orders
  ?status=completed&after=<date_after>T00:00:00Z&before=<date_before>T23:59:59Z&per_page=100&page=1

For each order, extract coupon_lines[]: code, discount, discount_tax.

Step 2 — Fetch coupon metadata

GET /wp-json/wc/v3/coupons?per_page=100&page=1

Enrich each coupon code with discount_type, amount, usage_count, expiry_date.

Step 3 — Aggregate by coupon code

For each coupon code seen in orders:

• order_count — distinct orders using this code
• total_discount — sum of coupon_lines[].discount
• avg_discount_per_order — total_discount / order_count
• total_discount_tax — sum of coupon_lines[].discount_tax

Step 4 — Sort and export

Sort by total_discount descending. Apply min_uses filter.

API Endpoints Used

GET  /wp-json/wc/v3/orders    — coupon_lines from completed orders
GET  /wp-json/wc/v3/coupons   — coupon metadata (type, configured amount)

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-coupon-discount-impact       ║
║  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-coupon-discount-impact    ║
║  RECORDS PROCESSED: <n>                  ║
║  OUTPUT: <filename>                      ║
╚══════════════════════════════════════════╝

COMPLETION (json format):

{
  "skill": "woo-coupon-discount-impact",
  "store": "<store_url>",
  "completed_at": "<ISO-8601>",
  "records_processed": <n>,
  "output_file": "<path>",
  "dry_run": false
}

Output Format

CSV filename: woo-coupon-discount-impact_<YYYY-MM-DD>_<YYYY-MM-DD>.csv Columns: coupon_code, discount_type, configured_amount, order_count, total_discount, avg_discount_per_order, total_discount_tax, usage_count_lifetime

Error Handling

Best Practices

• Compare configured_amount to avg_discount_per_order — percentage coupons on high-AOV orders can exceed intended discount budgets.
• Track total_discount as a percentage of gross revenue for the same period to measure overall promotional spend.
• Run monthly to detect coupon codes that are being shared or used beyond their intended audience.