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

# FastFlowPe

> FastFlowPe is a merchant payment platform supporting PayIn, PayOut, and Refund flows secured by short-lived X-API-Keys and IP whitelisting.

FastFlowPe is a REST API-based payment platform that lets you accept payments, initiate payouts, and manage refunds, all from a single integration. Every API request is secured with a short-lived X-API-Key tied to your whitelisted IP addresses, ensuring that only your servers can interact with your account.

<Tip>
  **Quick Reference**

  **Base URL:** `https://api.fastflowpe.com`

  **Auth header:** `x-api-key: <your_x_api_key>`

  **Key lifetime:** 30 minutes (rotate before expiry)

  **Dashboard:** [go.fastflowpe.com](https://go.fastflowpe.com/)
</Tip>

## What You Can Build

<CardGroup cols={3}>
  <Card title="PayIn" icon="credit-card" href="/collections/overview">
    Accept payments via payment links or the Transaction API with UPI, QR, cards, and net banking.
  </Card>

  <Card title="PayOut" icon="money-bill-transfer" href="/payouts/overview">
    Send funds to any Indian bank account over IMPS, NEFT, or RTGS with account verification.
  </Card>

  <Card title="Refunds" icon="rotate-left" href="/refunds/initiate-refund">
    Issue full or partial refunds against successful PayIn transactions with real-time status.
  </Card>
</CardGroup>

## Get Started in Four Steps

<Steps>
  <Step title="Get your credentials">
    Sign in to the [merchant dashboard](https://go.fastflowpe.com/) and copy your permanent [Client ID and Client Secret](/integration/client-credentials).
  </Step>

  <Step title="Whitelist your server IPs">
    Register your Primary (and optional Secondary) server IPs so FastFlowPe accepts calls only from your infrastructure. See [IP Whitelisting](/integration/ip-whitelisting).
  </Step>

  <Step title="Generate an X-API-Key">
    Exchange your Client ID and Secret for a short-lived `x-api-key`. See [API Authentication](/integration/api-authentication).
  </Step>

  <Step title="Make your first API call">
    Call any endpoint with `x-api-key` in the header. Start with [Create Payment Link](/collections/payment-links/create) or [Initiate Payout](/payouts/initiate-payout).
  </Step>
</Steps>

## Integration Setup

<CardGroup cols={2}>
  <Card title="Integration Guidelines" icon="map" href="/integration/integration-guidelines">
    End-to-end integration checklist before you make your first API call.
  </Card>

  <Card title="Client Credentials" icon="id-card" href="/integration/client-credentials">
    Locate your permanent Client ID and Client Secret in the dashboard.
  </Card>

  <Card title="API Authentication" icon="key" href="/integration/api-authentication">
    Generate an X-API-Key via API or dashboard and attach it to every request.
  </Card>

  <Card title="IP Whitelisting" icon="shield-halved" href="/integration/ip-whitelisting">
    Register your server IPs to lock down access to your account.
  </Card>
</CardGroup>

## How Authentication Works

FastFlowPe uses a two-layer security model to protect every API call you make.

**Permanent credentials (Client ID and Client Secret):** At signup, FastFlowPe issues you a Client ID and Client Secret. These never change and act as your identity on the platform. You use them solely to generate a short-lived X-API-Key.

**Short-lived tokens (X-API-Key):** Every API request must include a valid `x-api-key` header. Keys expire after **30 minutes**, after which you must generate a new one. Only one key can be active at a time; issuing a new key immediately revokes the previous one.

**IP whitelisting:** Each X-API-Key is bound to your registered Primary (and optional Secondary) IP addresses. FastFlowPe rejects any request that arrives from an unrecognized IP, even if it carries a valid key.

<Info>
  Manage your credentials, generate X-API-Keys, and configure IP whitelisting from the **Settings → API** section of the [merchant dashboard](https://go.fastflowpe.com/).
</Info>

## Real-Time Updates

Skip status polling in production. Configure a [webhook callback URL](/webhooks/callback-configuration) and FastFlowPe will POST JSON payloads to your HTTPS endpoint the moment any PayIn, PayOut, or Refund status changes.