This is a Toweringmedia Magento 2 extension guide in the Shipping category. Use this page for API-protection settings and shipping quote reliability.

• Module name: `Toweringmedia_ShippingGuard`
• Composer package: `toweringmedia/module-shipping-guard`

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Shipping Guard is a backend-only shipping quote protection layer that reduces unnecessary carrier API calls from incomplete or repetitive checkout requests.

Key capabilities:

• Address gating before carrier calls.
• Positive cache for successful quote responses.
• Retry throttling for invalid/incomplete inputs.
• Optional token-bucket rate limiting.
• Works across Luma, Hyva, and custom/headless checkouts.

cd /path/to/magento
composer require toweringmedia/module-shipping-guard:<VERSION>
php -d memory_limit=-1 bin/magento setup:upgrade
php -d memory_limit=-1 bin/magento setup:di:compile
php bin/magento setup:static-content:deploy -f
php bin/magento cache:flush

• Pick the version you are licensed for.
• To see available versions for your credentials:
  • `composer show -a toweringmedia/module-shipping-guard`

Go to: Stores > Configuration > Shipping > Shipping Guard

Recommended baseline settings:

• Enable Shipping Guard = Yes
• Positive cache TTL = 15 minutes
• Invalid input throttle = 60 seconds
• Diagnostics logging = Errors

Optional controls:

• Include region/city and weight/subtotal in cache key
• Enable token bucket limiter and set per-hour budget

• Incomplete addresses are gated before carrier API calls.
• Repeated complete quote requests produce cache hits.
• Rate limit behavior follows configured threshold when enabled.
• Checkout remains stable (no hard blocking exceptions) during gated conditions.

• No rates after valid address: verify carrier config and temporarily lower gating strictness for diagnostics.
• Too many API calls: increase cache TTL and confirm dedupe/rate limiter settings are enabled.
• Unexpected throttling: review invalid input throttle window and checkout address payload quality.
• Need deeper logs: temporarily switch diagnostics to verbose and inspect `[ShippingGuard]` log entries.

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