feat: add address check in checkout

[rsbh]

This PR will add a check for the address in the checkout.
If the customer already has the pin code and country as per minimum address required for stripe, then it will not auto-update the customer's billing address from the checkout flow.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
frontier	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 27, 2025 10:50am

[Copilot]

Pull Request Overview

Adds a check in the checkout flow to skip billing address collection when the customer already has a postal code and country, per Stripe’s minimum requirements.

• Introduce HasMinimumRequiredAddress on Address and Customer
• Add unit tests for these new methods
• Update Service.Create to set CustomerUpdate.Address based on the existing address

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
billing/customer/customer.go	Added methods to check for minimum required address
billing/customer/customer_test.go	Added tests for HasMinimumRequiredAddress on Address and Customer
billing/checkout/service.go	Conditionally set billing address collection param in checkout session

Comments suppressed due to low confidence (1)

billing/checkout/service.go:225

• Consider adding unit tests for Service.Create to verify that addressCollectionParam correctly switches to "never" when billingCustomer.HasMinimumRequiredAddress() is true, and defaults to auto otherwise.

// Determine address collection setting based on whether customer already has minimum required address

[coveralls]

Pull Request Test Coverage Report for Build 15273293571

Details

• 6 of 12 (50.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.009%) to 33.348%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
billing/checkout/service.go	0	6	0.0%

Totals
Change from base Build 15206650041:	0.009%
Covered Lines:	9871
Relevant Lines:	29600

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💛 - Coveralls