feat: fetch Google Pay config from Bolt API, add button theme support

[arstiefel]

Description

Simplifies the Google Pay integration by auto-fetching merchant/gateway configuration (tokenization spec, merchant IDs, merchant name) from Bolt's /v1/apm_config/googlepay API endpoint using the publishable key. Developers no longer need to provide gatewayMerchantId, googleMerchantId, or merchantName — only presentation options like currencyCode, amount, label, and billingAddressCollectionFormat. Also adds buttonTheme prop (dark/light) to the Google Pay button, wired through to Android's ButtonConstants.ButtonTheme.

Testing

• Updated GoogleWallet.test.tsx with new simplified config shape and APM config mock validation.
• Updated WalletTypes.test.ts to verify the new GooglePayConfig accepts only presentation options and all fields are optional.
• All 117 tests pass; TypeScript compiles clean.
• Manual testing needed on Android to verify the API fetch + Google Pay sheet flow end-to-end, and buttonTheme rendering (dark vs light).

Security Review

Important

A security review is required for every PR in this repository to comply with PCI requirements.

• I have considered and reviewed security implications of this PR and included the summary below.

Security Impact Summary

This PR adds an HTTP request to Bolt's API (GET /v1/apm_config/googlepay) using the publishable key as a merchant_token header. The publishable key is already a public credential designed for client-side use. The response contains non-sensitive merchant configuration (merchant name, tokenization gateway params). No new secrets, user data, or authentication flows are introduced. The tokenization and payment flows remain unchanged — the Google Pay token is still sent to Bolt's /v1/googlepay/tokenize endpoint with Bearer auth as before.

[snyk-io]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues
✅	Code Security	0	0	0	0	0 issues

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