Disable ACDC methods during BCDC migration for legacy UI merchants (5399)

[Narek13]

Issue Description

During migration from legacy to new UI, ACDC-eligible merchants who were using BCDC need to have all ACDC card payment methods disabled to maintain proper BCDC-only state. Currently, when these merchants migrate, the BCDC override flag is set correctly but ACDC card methods may remain enabled, creating potential conflicts.

PR Description

Adds logic to explicitly disable all ACDC card payment methods during migration when ACDC-eligible merchants were using BCDC in the legacy UI, ensuring clean BCDC-only state in the new UI.

Changes:

• Implemented disable_acdc_methods() method in PaymentSettingsMigration class
• Method iterates through all card payment methods from PaymentMethodsDefinition
• Disables each ACDC card method via toggle_method_state(false)
• Called during migration when is_bcdc_enabled_for_acdc_merchant() returns true

Problem Addressed:
In the legacy UI, ACDC-eligible merchants could use BCDC (Standard Card buttons) while having other card-related methods (like Google Pay) enabled simultaneously. Without explicit cleanup during migration, these ACDC methods could remain active in the new UI, causing:

• Payment method conflicts
• Inconsistent payment processing behavior
• Confusion about which card processing method is active

Before Migration	After

[github-actions]

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What's included:

• ✅ WordPress (latest)
• ✅ WooCommerce (latest)
• ✅ PayPal Payments plugin v3.1.2-pr3730-18169568475-g363c400 (built from this PR)

Login credentials:

• Username: admin
• Password: password

Plugin Details:

• Version: 3.1.2-pr3730-18169568475-g363c400
• Commit: 363c400
• Artifact: woocommerce-paypal-payments-3.1.2-pr3730-18169568475-g363c400

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_{🤖 Auto-generated for commit 363c400 • Last updated: 2025-10-01T17:05:55.485Z}

[Narek13]

This was discussed to cancel