# Postman Collection
source: https://developer.mastercard.com/bill-payment-validator/documentation/postman-collection/index.md

Postman is an application for easy RESTful API exploration. You can use Postman to test API calls multiple times without having to write code. You can save multiple sets of credentials to quickly test an API's calls in the sandbox and production environments.

### Bill Payment Validator --- Postman Setup {#bill-payment-validator--postman-setup}

Before running the collection, complete the following Bill Payment Validator-specific configuration:

1. **Fork the collection** using the button below, or import it into your Postman workspace
2. **Set your credentials** in the collection variables (or environment):
   * `consumerKey` --- your Consumer Key from the Mastercard Developers project page
   * `keyAlias` --- your signing key alias (Sandbox default: `keyalias`)
   * `keyPassword` --- your signing key password (Sandbox default: `keystorepassword`)
   * `p12FilePath` --- path to your `.p12` Sandbox Signing Key file
3. **Set the sandbox base URL:** `https://sandbox.api.mastercard.com/billpayAPI/v1/isRoutingValid`
4. **Send a test request** using the `POST /isRoutingValid` request in the collection with the Successful Validation sandbox data:
   * `RppsId`: `99887761` \| `BillerId`: `9998887771` \| `AccountNumber`: `1234567890` \| `TransactionAmount`: `250.00`
5. **Verify the response:** HTTP 200 with `"ResponseString": "Successful"`

For generic OAuth 1.0a setup steps in Postman, see the [Postman Collection guide](https://developer.mastercard.com/platform/documentation/developer-tools/postman-collection/).

Use the button below to fork our Postman collection and explore the API.
Run in Postman

## Next Steps {#next-steps}

* [Testing](https://developer.mastercard.com/bill-payment-validator/documentation/testing/index.md) --- full list of sandbox test scenarios for positive and negative validation
* [API Basics](https://developer.mastercard.com/bill-payment-validator/documentation/api-basics/index.md) --- OAuth 1.0a credential setup details
* [Code and Formats](https://developer.mastercard.com/bill-payment-validator/documentation/code-and-formats/index.md) --- error code reference for interpreting non-`Successful` responses