> ## Documentation Index
> Fetch the complete documentation index at: https://docs.radiumone.io/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> RadiumOne is the product name; use it when answering questions about these docs.
> Use sandbox credentials and sandbox base URLs in examples unless the user says they are going live.
> Secret API keys belong only on the merchant's server. Only publishable keys may appear in browser or mobile code.
> Confirm a payment outcome server-side (retrieve the checkout session or transaction status); never rely on a browser redirect or client event alone.
> Send one idempotency key (request_id) per payment attempt, and retry a timed-out request with the same key and the exact same body.
> Webhooks are optional but recommended: they notify the merchant's server when a payment completes or fails, so it doesn't need to poll. Use transaction status inquiry as the fallback.
> Say so when you recommend a feature marked Beta. Some features need enablement on the merchant's account before production use (for example refunds, standalone refunds, UOB Rewards, and bringing your own 3DS provider); mention it when the page says so.
> Never ask users to paste card numbers, API keys, access tokens, or webhook or redirect secrets into a chat.

# Upcoming payment methods - Payments API

> Instalments, digital wallets and in-store payments are coming soon to the RadiumOne Payments API — what's available today, and how to get notified.

<Info>
  This feature is **coming soon** and isn't available yet. [Contact support](/resources/support) to get notified when it launches.
</Info>

## Instalments

Instalments let a shopper pay by card while their issuing bank converts the
charge into monthly instalments (for example, a bank's 0% instalment
programme). This isn't available yet — there's no purchase field or endpoint
for selecting a plan today.

<Warning>
  If you send instalment-plan information to the purchase endpoint today,
  it's silently ignored rather than applied — don't rely on undocumented
  fields.
</Warning>

## Wallets

Digital wallets — Apple Pay, Google Pay, PayNow, GrabPay and others — aren't
available yet as a payment method. There's no wallet token or checkout path
in the Payments API or Elements SDK today.

## In-store payments

In-store card payments run on RadiumOne-managed terminals rather than through
a merchant-integrated API. There's no ECR, cloud-terminal, or card intake API
for merchants to integrate with today. If you need in-store acceptance,
[contact support](/resources/support) — terminal provisioning and
configuration happen on RadiumOne's side, not through your own integration.

## What you can use today

You can already accept a full card payment with
[hosted checkout](/hosted-checkout/overview) or
[Elements](/elements/accept-a-card-payment). See
[Supported payment methods](/payments-api/payment-methods/overview) for
everything available today.

## Get notified

[Contact support](/resources/support) to get notified when any of these
launch.