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

# Introduction

> Get started with the Rex Banking-as-a-Service API

The Rex BaaS API lets you embed real bank accounts, transfers, and
collections into your product — under your own brand, backed by a
licensed bank ledger. This is the same platform powering Rex's own mobile
banking app, exposed to approved partners.

## What you can build

* **Wallets for your users** — issue each of them a dedicated Rex account
  number ([Virtual Accounts](/api-reference/virtual-accounts/create-a-virtual-account)),
  fund it, move money between accounts, and send to other banks.
* **Real-time notifications** — subscribe a webhook to be notified the
  moment money moves, signed so you can verify it really came from Rex
  ([Webhooks](/webhooks/overview)).

## Get your first account

<Steps>
  <Step title="Register">
    [Register](/api-reference/authentication/register-a-partner-account) with your business
    name, email, and a password. You'll get a 6-digit OTP by email.
  </Step>

  <Step title="Verify your email">
    [Verify the OTP](/api-reference/authentication/verify-registration-otp) to activate your account.
  </Step>

  <Step title="Log in">
    [Log in](/api-reference/authentication/log-in) to get a bearer token — see [Authentication](/authentication) for what it can and can't do.
  </Step>

  <Step title="Complete onboarding">
    Save your [business information](/api-reference/onboarding/save-business-information),
    add a [compliance representative](/api-reference/onboarding/add-your-compliance-representative),
    upload the documents your business type requires (see the
    [Going Live Checklist](/guides/going-live-checklist)), sign the
    [agreement](/api-reference/onboarding/sign-the-partner-agreement), and
    [submit](/api-reference/onboarding/submit-your-application-for-review).
  </Step>

  <Step title="Build in sandbox">
    While your application is under review, everything works in `sandbox` —
    [fund your test balance](/api-reference/wallet/fund-your-sandbox-balance)
    and start creating accounts and moving money. See [Sandbox vs. Live](/guides/sandbox-vs-live).
  </Step>

  <Step title="Go live">
    Once approved, [switch your environment to live](/api-reference/onboarding/switch-environment)
    and repeat the same integration against real money.
  </Step>
</Steps>

## Base URLs

| Environment | Base URL                                        |
| ----------- | ----------------------------------------------- |
| Live        | `https://api.rexmfbank.com/baas/api/v1`         |
| Sandbox     | `https://sandbox-api.rexmfbank.com/baas/api/v1` |

## Where to go next

* [Authentication](/authentication) — how tokens work, and one thing worth
  reading before you build against this.
* [Errors](/errors) — the one response shape every endpoint shares.
* [Webhooks Overview](/webhooks/overview) — get notified instead of polling.