APIs - September release - ACCS

[jhadobe]

This PR updates the webapi guide with changes for the September release of ACCS. Currently these changes are scheduled to be published on 9/8.

This PR consists of the following PRs:

• AC-16808: Document the new Free Gift cart price rule action type #590

• USF-4290: document search filter on customer.orders #600

• COMDOX-1780 configuration copy - ACCS #603

• SCP Example for persistent cart/wishlist #607

• CCSAAS-5091 custom email REST update/delete #608

• Reference sections #609

• Update schema changes in this PR before merging

whatsnew
Added multiple changes as part of the Adobe Commerce as a Cloud Service September release:

• Added System configuration, which covers the /V1/system/config REST endpoint that syncs configurations between Adobe Commerce as a Cloud Service environments.
• Added a storeConfig query example documenting the new persistent shopping cart and customer account sharing fields (persistent_enabled, persistent_shopping_cart, persistent_options_wishlist, share_customer_accounts_scope).
• Updated Email triggering through the REST API with new PUT and DELETE /V1/custom-email/templates/{id} endpoints for updating and deleting custom email templates.
• Added sourceAvailability query documentation for reading per-source inventory availability by SKU, scoped to the current sales channel.
• Added the selectFreeGiftForCart mutation, which lets shoppers select a gift SKU when a Free Gift cart price rule requires a choice, including support for configurable and bundle gift products.
• Added a search field to CustomerOrdersFilterInput on the customer query, letting a signed-in customer search their order history by order number, product name, or SKU.

[github-actions]

🔍 Linter Report

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                     LINTER REPORT
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Generated: 2026-09-04T21:56:15.298Z
Mode: Full Linting (all rules + dead links check)
Target Directory: /home/runner/work/commerce-webapi/commerce-webapi
Skipped Rules:
  - check-frontmatter → src/pages/includes
  - missing-heading → src/pages/includes

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Files to process: 20

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📄 FILE: src/pages/config.md
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  ⚠️  WARNING
    Location: Line 1:1
    Message: Missing frontmatter section - add --- at the beginning with title and description
    Rule: check-frontmatter

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📄 FILE: src/pages/graphql/schema/b2b/company/mutations/create-address.md
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  ⚠️  WARNING
    Location: Line 3:1
    Message: Description is too long (200 characters). Consider keeping it under 160 characters.
    Rule: check-frontmatter

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📄 FILE: src/pages/graphql/schema/b2b/company/mutations/delete-address.md
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  ⚠️  WARNING
    Location: Line 3:1
    Message: Description is too long (209 characters). Consider keeping it under 160 characters.
    Rule: check-frontmatter

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📄 FILE: src/pages/graphql/schema/b2b/company/mutations/set-default-address.md
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  ⚠️  WARNING
    Location: Line 3:1
    Message: Description is too long (294 characters). Consider keeping it under 160 characters.
    Rule: check-frontmatter

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📄 FILE: src/pages/graphql/schema/b2b/company/mutations/update-address.md
───────────────────────────────────────────────────────────────
  ⚠️  WARNING
    Location: Line 3:1
    Message: Description is too long (207 characters). Consider keeping it under 160 characters.
    Rule: check-frontmatter


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                        SUMMARY
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  📁 Files processed:    20
  📄 Files with issues:  5
  ❌ Total errors:       0
  ⚠️  Total warnings:     5
  📋 Total issues:       5

Result: ⚠️  PASSED WITH WARNINGS - No fatal errors

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