docs: clarify Cloudflare R2 payment methods

README.md

@@ -94,7 +94,7 @@ Complete setup in 5 simple web steps:
 
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-> 💡 **Deployment Tip (Cloudflare R2 Billing)**: Although Cloudflare R2 offers a generous free tier that note-taking workloads are unlikely to ever exceed, it requires binding a payment method (such as a dual-currency credit card) to activate. Based on personal experience, for users in mainland China, VISA cards from China Merchants Bank (CMB) or Shanghai Pudong Development Bank (SPDB) are typically the fastest to get verified (and most of these cards have no annual fees or easily waivable ones, so there are no extra holding costs).
+> 💡 **Deployment Tip (Cloudflare R2 Billing)**: Although Cloudflare R2 offers a generous [free storage allowance](https://developers.cloudflare.com/r2/pricing/#free-tier) that note-taking workloads are unlikely to ever exceed, you must first activate an R2 subscription and add a payment method. Cloudflare [officially supports](https://developers.cloudflare.com/billing/get-started/update-billing-info/#supported-payment-methods) UnionPay, Visa, Mastercard, and other cards, as well as PayPal, Apple Pay, Google Pay, and other payment methods.
 
 ## Multi-Account Login
 

README.zh-CN.md

@@ -94,7 +94,7 @@ EdgeEver 采用纯 Serverless 架构，完全运行在 Cloudflare 免费配额
 
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-> 💡 **部署提示（Cloudflare R2 绑定）**：虽然 Cloudflare R2 存储提供了足够慷慨、在笔记场景中几乎永远不会超量的免费额度，但开通时仍需绑定支付方式（双币信用卡）。根据个人经验，在国内 VISA 信用卡中，招商和浦发的验证与开通最快捷，且这类卡片大多免年费（或极易通过刷卡免年费），无需担心持有成本。
+> 💡 **部署提示（Cloudflare R2 付款方式）**：虽然 Cloudflare R2 存储提供了足够慷慨、在笔记场景中几乎永远不会超量的[免费存储额度](https://developers.cloudflare.com/r2/pricing/#free-tier)，但需先开通 R2 subscription 并绑定付款方式。Cloudflare [官方支持](https://developers.cloudflare.com/billing/get-started/update-billing-info/#supported-payment-methods) 银联（UnionPay）、Visa、Mastercard 等银行卡，以及 PayPal、Apple Pay、Google Pay 等付款方式。
 
 ## 多账号登录