Added shipping method data to tax module context

[pepijn-vanvlaanderen]

Summary

What — What changes are introduced in this PR?

Added shipping method data to the normalize tax module context.

Why — Why are these changes relevant or necessary?

We need to override the tax provider to set taxes based on the shipping method (when it is a pickup). I.e. we have pickup locations in the Netherlands, but we also ship abroad. When someone from Germany chooses to pickup, the tax needs to be overriden to the Dutch VAT.

To make this possible we need the shipping method data in the taxCalculationContext of the getTaxLines in the CustomTaxProvider.

How — How have these changes been implemented?

Extensions have been made to the normalizeTaxModuleContext function

Testing — How have these changes been tested, or how can the reviewer test the feature?

We implemented the patch locally and seen the data passed through properly.

---

Examples

Provide examples or code snippets that demonstrate how this feature works, or how it can be used in practice.
This helps with documentation and ensures maintainers can quickly understand and verify the change.

  async getTaxLines(
    itemLines: TaxTypes.ItemTaxCalculationLine[],
    shippingLines: TaxTypes.ShippingTaxCalculationLine[],
    taxCalculationContext: TaxTypes.TaxCalculationContext
  ): Promise<(TaxTypes.ItemTaxLineDTO | TaxTypes.ShippingTaxLineDTO)[]> {
    const shippingOptionIds = taxCalculationContext.shipping_methods?.map(sm => sm.shipping_option_id) ?? [];
    
    // If a customer chooses pickup in shop/warehouse, use Dutch tax rate
    let hasPickOption = false;
    if (shippingOptionIds.length > 0) {
      const result = await this.getShippingOptions(shippingOptionIds);
      hasPickOption = result.length > 0;
    }
    
    ...
}

---

Checklist

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• I have added a changeset for this PR
  • Every non-breaking change should be marked as a patch
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• The changes are covered by relevant tests
• I have verified the code works as intended locally
• I have linked the related issue(s) if applicable

---

[changeset-bot]

🦋 Changeset detected

Latest commit: 5b572c9

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 74 packages

Name	Type
@medusajs/core-flows	Patch
@medusajs/types	Patch
@medusajs/medusa	Patch
integration-tests-http	Patch
@medusajs/draft-order	Patch
@medusajs/framework	Patch
@medusajs/js-sdk	Patch
@medusajs/modules-sdk	Patch
@medusajs/orchestration	Patch
@medusajs/utils	Patch
@medusajs/workflows-sdk	Patch
@medusajs/medusa-oas-cli	Patch
@medusajs/admin-bundler	Patch
@medusajs/dashboard	Patch
@medusajs/test-utils	Patch
@medusajs/analytics	Patch
@medusajs/api-key	Patch
@medusajs/auth	Patch
@medusajs/cache-inmemory	Patch
@medusajs/cache-redis	Patch
@medusajs/caching	Patch
@medusajs/cart	Patch
@medusajs/currency	Patch
@medusajs/customer	Patch
@medusajs/event-bus-local	Patch
@medusajs/event-bus-redis	Patch
@medusajs/file	Patch
@medusajs/fulfillment	Patch
@medusajs/index	Patch
@medusajs/inventory	Patch
@medusajs/link-modules	Patch
@medusajs/locking	Patch
@medusajs/notification	Patch
@medusajs/order	Patch
@medusajs/payment	Patch
@medusajs/pricing	Patch
@medusajs/product	Patch
@medusajs/promotion	Patch
@medusajs/region	Patch
@medusajs/sales-channel	Patch
@medusajs/settings	Patch
@medusajs/stock-location	Patch
@medusajs/store	Patch
@medusajs/tax	Patch
@medusajs/user	Patch
@medusajs/workflow-engine-inmemory	Patch
@medusajs/workflow-engine-redis	Patch
@medusajs/analytics-local	Patch
@medusajs/analytics-posthog	Patch
@medusajs/auth-emailpass	Patch
@medusajs/auth-github	Patch
@medusajs/auth-google	Patch
@medusajs/caching-redis	Patch
@medusajs/file-local	Patch
@medusajs/file-s3	Patch
@medusajs/fulfillment-manual	Patch
@medusajs/locking-postgres	Patch
@medusajs/locking-redis	Patch
@medusajs/notification-local	Patch
@medusajs/notification-sendgrid	Patch
@medusajs/payment-stripe	Patch
@medusajs/oas-github-ci	Patch
@medusajs/cli	Patch
@medusajs/deps	Patch
@medusajs/telemetry	Patch
@medusajs/admin-sdk	Patch
@medusajs/admin-shared	Patch
@medusajs/admin-vite-plugin	Patch
@medusajs/icons	Patch
@medusajs/toolbox	Patch
@medusajs/ui-preset	Patch
create-medusa-app	Patch
medusa-dev-cli	Patch
@medusajs/ui	Patch

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[cursor]

Bug: Tax Context Mismatch Causes Incorrect Calculations

The tax context is populated from orderOrCart.shipping_methods, but the step's shippingMethods parameter is used for tax calculation. This inconsistency can lead to the tax context containing different shipping methods than those actually being taxed, potentially causing incorrect calculations.

 

[willbouch]

LGTM. Will be merged for the next release. If you can in the meantime, it would be nice to have this covered by a test