Create a quote grant request

Before a client can call most of the Open Payments APIs, it must receive a grant from the appropriate authorization server.

The snippets below enable a client to request a grant for a quote. The request to the authorization server must indicate the quote access type the and actions the client wants to take at the resource server.

Before you begin

We recommend creating a wallet account on the test wallet. Creating an account allows you to test your client against the Open Payments APIs by using an ILP-enabled wallet funded with play money.

Request a quote grant

TypeScript/NodeJS

Prerequisites

Initial configuration

If you’re using JavaScript, only do the first step.

1. Add "type": "module" to package.json.
2. Add the following to tsconfig.json

   {
     "compilerOptions": {
       "target": "ES2022",
       "module": "ES2022"
     }
   }

// Import dependencies
import { createAuthenticatedClient } from '@interledger/open-payments'

// Initialize client
const client = await createAuthenticatedClient({
  walletAddressUrl: WALLET_ADDRESS,
  privateKey: PRIVATE_KEY_PATH,
  keyId: KEY_ID
})

// Get wallet address information
const walletAddress = await client.walletAddress.get({
  url: WALLET_ADDRESS
})

// Request quote grant
const grant = await client.grant.request(
  {
    url: walletAddress.authServer
  },
  {
    access_token: {
      access: [
        {
          type: 'quote',
          actions: ['create', 'read', 'read-all']
        }
      ]
    }
  }
)

// Check grant state
if (isPendingGrant(grant)) {
  throw new Error('Expected non-interactive grant')
}

// Output
console.log('QUOTE_ACCESS_TOKEN =', grant.access_token.value)
console.log('QUOTE_ACCESS_TOKEN_MANAGE_URL = ', grant.access_token.manage)

For TypeScript, run tsx path/to/directory/index.ts. View full TS source

For JavaScript, run node path/to/directory/index.js. View full JS source

Rust

Prerequisites

// Import dependencies
use open_payments::client::api::UnauthenticatedResources;
use open_payments::client::AuthenticatedResources;
use open_payments::snippets::utils::{create_authenticated_client, get_env_var, load_env};
use open_payments::types::{
    auth::{AccessItem, AccessTokenRequest, GrantRequest, QuoteAction},
    GrantResponse,
};

// Initialize client
// Authenticated client can be also used for unauthenticated resources
let client = create_authenticated_client()?;

// Get wallet address information
let wallet_address_url = get_env_var("WALLET_ADDRESS_URL")?;
let wallet_address = client.wallet_address().get(&wallet_address_url).await?;

// Request quote grant
let grant_request = GrantRequest::new(
    AccessTokenRequest {
        access: vec![AccessItem::Quote {
            actions: vec![QuoteAction::Create, QuoteAction::Read, QuoteAction::ReadAll],
        }],
    },
    None,
);

println!(
    "Grant request JSON: {}",
    serde_json::to_string_pretty(&grant_request)?
);

let response = client
    .grant()
    .request(&wallet_address.auth_server, &grant_request)
    .await?;

// Output
match response {
    GrantResponse::WithToken { access_token, .. } => {
        println!("Received access token: {:#?}", access_token.value);
        println!(
            "Received access token manage URL: {:#?}",
            access_token.manage
        );
    }
    GrantResponse::WithInteraction { .. } => {
        unreachable!("Interaction not required for quotes");
    }
}

View full source

PHP

Prerequisites

// Import dependencies
use OpenPayments\AuthClient;
use OpenPayments\Config\Config;

// Initialize client
$config = new Config(
    $WALLET_ADDRESS,
    $PRIVATE_KEY,
    $KEY_ID
);
$opClient = new AuthClient($config);

// Get wallet address information
$wallet = $opClient->walletAddress()->get([
    'url' => $config->getWalletAddressUrl()
]);

// Request quote grant
$grant = $opClient->grant()->request(
    [
        'url' => $wallet->authServer
    ],
    [
        'access_token' => [
            'access' => [
                [
                    'type' => 'quote',
                    'actions' => ['create', 'read', 'read-all']
                ]
            ]
        ],
        'client' => $config->getWalletAddressUrl()
    ]
);

// Check grant state
if ($grant instanceof \OpenPayments\Models\PendingGrant) {
    throw new \Error('Expected non-interactive grant');
}

// Output
echo 'QUOTE_ACCESS_TOKEN: ' . $grant->access_token->value . PHP_EOL;
echo 'QUOTE_ACCESS_TOKEN_MANAGE_URL: ' . $grant->access_token->manage . PHP_EOL;

echo 'GRANT OBJECT: ' . PHP_EOL . print_r($grant, true);

View full source

Go

Prerequisites

package main

// Import dependencies
import (
  "context"
  "encoding/json"
  "fmt"
  "log"

  op "github.com/interledger/open-payments-go"
  as "github.com/interledger/open-payments-go/generated/authserver"
)

func main() {
  // Initialize client
  client, err := op.NewAuthenticatedClient(WALLET_ADDRESS_URL, PRIVATE_KEY_BASE_64, KEY_ID)
  if err != nil {
    log.Fatalf("Error creating authenticated client: %v\n", err)
  }

  // Get wallet address information
  walletAddress, err := client.WalletAddress.Get(context.TODO(), op.WalletAddressGetParams{
    URL: WALLET_ADDRESS_URL,
  })
  if err != nil {
    log.Fatalf("Error fetching wallet address: %v\n", err)
  }

  // Request quote grant
  quoteAccess := as.AccessQuote{
    Type: as.Quote,
    Actions: []as.AccessQuoteActions{
      as.Create,
      as.Read,
    },
  }
  accessItem := as.AccessItem{}
  if err := accessItem.FromAccessQuote(quoteAccess); err != nil {
    log.Fatalf("Error creating AccessItem: %v\n", err)
  }
  accessToken := struct {
    Access as.Access `json:"access"`
  }{
    Access: []as.AccessItem{accessItem},
  }

  grant, err := client.Grant.Request(context.TODO(), op.GrantRequestParams{
    URL:         *walletAddress.AuthServer,
    RequestBody: as.GrantRequestWithAccessToken{AccessToken: accessToken},
  })
  if err != nil {
    log.Fatalf("Error requesting grant: %v\n", err)
  }

  // Check grant state
  if grant.IsInteractive() {
    log.Fatalf("Expected non-interactive grant")
  }

  // Output
  grantJSON, err := json.MarshalIndent(grant, "", "  ")
  if err != nil {
    log.Fatalf("Error marshaling grant: %v\n", err)
  }
  fmt.Println("GRANT:", string(grantJSON))
  fmt.Println("QUOTE_ACCESS_TOKEN =", grant.AccessToken.Value)
  fmt.Println(
    "QUOTE_ACCESS_TOKEN_MANAGE_URL =",
    grant.AccessToken.Manage,
  )

}

Java

Prerequisites

// Import dependencies
import org.interledger.openpayments.httpclient.OpenPaymentsHttpClient;
import org.interledger.openpayments.IOpenPaymentsClient;

// Initialize client
var client = OpenPaymentsHttpClient.defaultClient(
"WalletAddress",
"PrivateKeyPEM",
"KeyId"
);

// Get wallet address information
var senderWallet = client.getWalletAddress("https://cloudninebank.example.com/customer");

// Request quote grant
var grantRequest = this.client.createGrantQuote(senderWallet);

// Output
log.info("QUOTE_GRANT: {}", grantRequest);

References

• API specification
• Grant negotiation and authorization