# Overview
You exchange these credentials for an access token that authorizes your REST API calls. To test your web and mobile apps, you create sandbox accounts
Logging into the [Smart Platform](https://app.smartfastpay.com) to get credentials and create sandbox accounts requires a developer, support, or admin account. Each account provides different levels of access to API functionality.
Capabilities
Developer Account
Support Account
Admin Account
Access Smart Platform
x
x
x
Customize Payment Page
x
x
Create New Users
x
Create Credentials
x
Manage Transactions (Just on Sandbox Env.)
x
x
Generate Reports
x
x
***
### Get credentials
To generate REST API credentials for the sandbox and live environments:
1. Log in to the Smart Platform with your account.
2. Under the **MANAGEMENT** menu, select **Credentials**.
3. Remember to write down the chosen client\_secret, once saved, there is no way to recover it, you will need to create a new one.
***
### Get an access token
Your access token authorizes you to use the SmartFastPay REST API server. To call a REST API in your integration, exchange your client ID and secret for an access token in an OAuth 2.0 token call. While there are a few ways to get a token, here are examples using both the Postman app and a cURL command.
Your own environment's HTTP library or function may have `username` and `password` fields or an `auth` parameter in which you pass your client ID and secret. You can also add your Base64 encoded client ID and secret in an `Authorization: Basic` header.
***
### Make REST API calls
In REST API calls, include the URL to the API service for the environment:
* Sandbox: `https://sandbox.smartfastpay.com`
* Live: `https://api.smartfastpay.com`
Also, include your access token to prove your identity and access protected resources.
This sample call, which shows the Transaction creates, includes a bearer token in the Authorization request header. This type of token lets you complete an action on behalf of a resource owner.
```bash
curl -v --location --request POST 'https://sandbox.smartfastpay.com/transaction/checkout' \
--header 'Content-Type: application/json' \
--header 'Authorization: Bearer ' \
--data-raw '{
"customer_id": "58f0c005-3b7d-4c75-81f3-93b9a6fee864",
"branch": "Office 2",
"name": "Richard Roe",
"amount": 4300,
"currency": "USD",
"callback": "http://mysite.com/api/notification",
"transaction": {
"id": "b08e3897-6505-4bb4-81a5-6e3a1d29e277",
"redirect": {
"url": "http://mysite.com/success_payment",
"type": "URL"
}
}
}'
```
The response shows the page or url, choosed by redirect type:
```json
{
"requestId": "73eaaecf-1bf4-4847-b4a9-8c615e891e1b",
"data": {
"url": "https://sandbox.smartfastpay.com/checkout/v1/f834fc1b-c8a0-4613-bcc9-2c188f6ef180",
"transaction_id": "f834fc1b-c8a0-4613-bcc9-2c188f6ef180"
}
}
```