CCSAAS-5091 custom email REST update/delete

[jhadobe]

Purpose of this pull request

Documents the new PUT and DELETE /V1/custom-email/templates/{id} endpoints for updating and deleting custom email templates.

whatsnew
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.

[github-actions]

🔍 Linter Report

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                     LINTER REPORT
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Generated: 2026-09-02T22:51:41.954Z
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: 1


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                        SUMMARY
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  📁 Files processed:    1
  📄 Files with issues:  0
  ❌ Total errors:       0
  ⚠️  Total warnings:     0
  📋 Total issues:       0

Result: ✅ PASSED - All files passed linting successfully!

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[keharper]

Review the note on line 17. Perhaps "newly" should be replaced with "customer"

[github-actions]

🔍 Linter Report

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═══════════════════════════════════════════════════════════════
                     LINTER REPORT
═══════════════════════════════════════════════════════════════

Generated: 2026-09-03T17:56:22.752Z
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

───────────────────────────────────────────────────────────────

Files to process: 1


═══════════════════════════════════════════════════════════════
                        SUMMARY
═══════════════════════════════════════════════════════════════

  📁 Files processed:    1
  📄 Files with issues:  0
  ❌ Total errors:       0
  ⚠️  Total warnings:     0
  📋 Total issues:       0

Result: ✅ PASSED - All files passed linting successfully!

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This comment was automatically generated by the linter bot.

[github-actions]

🔍 Linter Report

Click to expand full report

═══════════════════════════════════════════════════════════════
                     LINTER REPORT
═══════════════════════════════════════════════════════════════

Generated: 2026-09-03T18:00:36.749Z
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

───────────────────────────────────────────────────────────────

Files to process: 1


═══════════════════════════════════════════════════════════════
                        SUMMARY
═══════════════════════════════════════════════════════════════

  📁 Files processed:    1
  📄 Files with issues:  0
  ❌ Total errors:       0
  ⚠️  Total warnings:     0
  📋 Total issues:       0

Result: ✅ PASSED - All files passed linting successfully!

═══════════════════════════════════════════════════════════════

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This comment was automatically generated by the linter bot.