OpenID Connect for Servers is the preferred way to authenticate with the Pismo platform. It provides greater security guarantees in service communications than basic authentication using client credentials. In addition, OpenID Connect supports multi-tenancy. This means that, for example, you can give a third party access to only a specific set of endpoints within your organization.

Server authentication

During onboarding to production, you must generate at least one pair of public and private keys for OpenID authentication. Then, you must generate and sign a JSON Web Token (JWT) for each key pair that you generate. For more information about JWTs, see Generate your JWT.

Use the OpenSSL toolkit to generate a private key and a public key, using the following commands:

Generate a private key:
  $ openssl genpkey -out rsakey.pem -algorithm RSA -pkeyopt rsa_keygen_bits:2048
Generate a public key based on the private key yougenerated:
  $ openssl rsa -in rsakey.pem -out rsa.pub -pubout -outform PEM

Store your private key securely, and send the public key to your Pismo representative, along with your Org ID.
Generate your JWT using the private key associated with the pubic key you shared using the claims values here.
Request an access token using the endpoint Get OpenID access token

📘
The response to this call includes an access token that you can use with an API endpoint. If the response does not include an access token, your JWT might not be properly formed.

Retrieve the access token returned in the Pismo response.
Use this access token to make API calls.

The following diagram illustrates steps 3 to 6:

Generate your JWT

You generate and sign a JWT using the private key you generated (in step 1 above). This JWT should contain the following claims:

key	Type	Mandatory	Value	description
alg	Fixed string value	Yes	RS256
typ	Fixed string value	Yes	JWT
iss	Fixed string value	Yes		Value provided by Pismo.
sub	Fixed string value	Yes		Value provided by Pismo.
aud	Fixed string value	Yes		Value provided by Pismo
iat	Timestamp number	Yes	ex: 1697044489	The current time in seconds since the UNIX epoch.
exp	Timestamp number	Yes	ex:1697048089	The time in seconds since the UNIX epoch at which the token expires. It can be a maximum of 3600 seconds later than the `iat`.
tenant_id	Fixed string value	Yes	ex: tn_example	Value provided by Pismo. The identifier of the tenant of the user
uid	String value	Yes on those endpoints	ex: 123456	The Account ID of the Pismo customer. If you want a token without Account ID, do not send the claim uid on the JWT.
pismo	Object type	Yes	ex: "pismo": { "group": "pismo-v1:sample-group:rw" },	The identifier of the group that you want your token to have access to. A group has access to a certain subset of endpoints, you can ask your Pismo customer representative for more information on the groups that can be used.
customClaims	Object type	No	"customClaims": { "custom1": "someValue", "userexample": "myusername" },	Optional custom claims.

Example of the structure of the JWT that you should generate on your side in order to use OpenID authentication:

Header
{
  "alg": "RS256",
  "typ": "JWT"
}

Payload
{
  "aud": "<value provided by Pismo>",
  "iss": "<value provided by Pismo>",
  "sub": "<Value provided by Pismo>",
  "tenant_id": "<Value provided by Pismo>",
  "pismo": {
    "group": "pismo-v1:some-samplegroup:rw"
  },
  "uid": "123123",
  "exp": 1724348241,
  "iat": 1724344641,
  "customClaims": {
    "custom1": "someValue",
    "userexample": "[email protected]"
  }
}

For the list of groups you can use you can check with your Pismo representative.

uid is required on all endpoints that requires account ID Authentication

To generate JWTs, we recommend using one of the libraries provided at jwt.io. Another option is to use Google/Firebase helper libraries, where you use the private key in Google's Service Account format and provide it to the libraries. For more information about this implementation, refer to the Google Cloud Platform (GCP) documentation.

The following code sample shows how to create a signed JWT in a few languages:

package main

import (
    "fmt"
    "time"

    "github.com/dgrijalva/jwt-go"
)

var mySigningKey = []byte(`
-----BEGIN PRIVATE KEY-----
...
-----END PRIVATE KEY-----
`)

func main() {

    key, err := jwt.ParseRSAPrivateKeyFromPEM(mySigningKey)
    fmt.Println(err)

    token := jwt.NewWithClaims(jwt.SigningMethodRS256, jwt.MapClaims{
        "iss":       "[email protected]",
        "aud":       "https://identitytoolkit.googleapis.com/google.identity.identitytoolkit.v1.IdentityToolkit",
        "exp":       time.Now().Add(time.Hour).Unix(),
        "iat":       time.Now().Unix(),
        "sub":       "[email protected]",
        "uid":       "12345678910",
        "tenant_id": "test-pbrj4",
    })

    // Sign and get the complete encoded token as a string using the secret
    tokenString, err := token.SignedString(key)
    fmt.Println(tokenString, err)

}

package com.star.sud;

import java.io.*;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.time.Instant;
import java.util.*;

import io.jsonwebtoken.*;


public class JwtTokenwithRsa {

	//Reference to your private key
	public static final String PRIVATE_KEY_FILE_PATH = "RSA/rsakey.pem";

	public static void main(String[] args) {
		try {
			JwtTokenwithRsa tokenwithRsa = new JwtTokenwithRsa();
			tokenwithRsa.generateJWTWithRsa();

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public String generateJwtToken(PrivateKey privateKey) {
		JwtBuilder builder = Jwts.builder().signWith(SignatureAlgorithm.RS256, privateKey);

		long issuedAt = Instant.now().getEpochSecond();
		long expiresAt = Instant.now().plusSeconds(3600).getEpochSecond();
		Map<String,String> pismoClaims = new HashMap<String,String>();
		pismoClaims.put("group","pismo-v1:samplegroup:rw");

		builder.claim("aud", "value provided by Pismo");
		builder.claim("sub", "value provided by Pismo");
		builder.claim("iss", "value provided by Pismo");
		builder.claim("exp", expiresAt);
		builder.claim("iat",issuedAt);
		builder.claim("pismo", pismoClaims);
		builder.claim("tenant_id", "Your Tenant ID");
		builder.claim("uid", "Account Id or Tenant Id");


		String token = builder.compact();
		return token;
	}

	public void generateJWTWithRsa() throws Exception {
		KeyPairGenerator keyGenerator = KeyPairGenerator.getInstance("RSA");
		keyGenerator.initialize(1024);

		File f = new File(PRIVATE_KEY_FILE_PATH);
		PrivateKey privateKey = readPrivateKey(f);


		// Generate Token
		String id = UUID.randomUUID().toString();
		String token = generateJwtToken(privateKey);
		System.out.println("TOKEN:");
		System.out.println(token);

	}

	public RSAPrivateKey readPrivateKey(File file) throws Exception {
		String key = new String(Files.readAllBytes(file.toPath()), Charset.defaultCharset());

		String privateKeyPEM = key
				.replace("-----BEGIN PRIVATE KEY-----", "")
				.replaceAll(System.lineSeparator(), "")
				.replace("-----END PRIVATE KEY-----", "");

		byte[] encoded = Base64.getDecoder().decode(privateKeyPEM);

		KeyFactory keyFactory = KeyFactory.getInstance("RSA");
		PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(encoded);
		return (RSAPrivateKey) keyFactory.generatePrivate(keySpec);
	}

}

To be released

To be released

Using the JWT to request an access token

After generating the signed JWT, you can use it to request an access token. This access token request is an HTTPS POST request.

Method: POST

Content-Type: application/json

Endpoint: {environment}/passport/v1/oauth2/token

Request body payload:

Property Name	Type	Description
token	string	A custom token you use to request an access token.

The following sample code shows a cURL POST request for an access token in the Pismo Sandbox:

curl --request POST \
--url https://sandbox.pismolabs.io/passport/v1/oauth2/token \
--header 'Content-Type: application/json' \
--data '{
"token":"eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJhdWQiOiI8dmFsdWUgcHJvdmlkZWQgYnkgUGlzbW8-IiwiaXNzIjoiPHZhbHVlIHByb3ZpZGVkIGJ5IFBpc21vPiIsInN1YiI6IjxWYWx1ZSBwcm92aWRlZCBieSBQaXNtbz4iLCJ0ZW5hbnRfaWQiOiI8VmFsdWUgcHJvdmlkZWQgYnkgUGlzbW8-IiwicGlzbW8iOnsiZ3JvdXAiOiJwaXNtby12MTpzb21lLXNhbXBsZWdyb3VwOnJ3In0sInVpZCI6IjEyMzEyMyIsImV4cCI6MTcyNDM0ODI0MSwiaWF0IjoxNzI0MzQ0NjQxLCJjdXN0b21DbGFpbXMiOnsiY3VzdG9tMSI6InNvbWVWYWx1ZSIsInVzZXJleGFtcGxlIjoidXNlckB1c2VyLmNvbSJ9fQ.TP8Awq4jgF_JcrhZkhumyifOka0uXmJ-yC5a9fO6WBHX6HBedDAy4vp2BfPsZveiKaa1cJj1ys1xbXnJsvZpXFgwglnY46Ru_jLskXiahBeZg1LIJtUJegf7wqSeUPB1ESTkGLoXEHZKHLH5PZ3FqCHfwz8Vb9pb7iBNe7PMJqMgK8k5TgeEyyN6C3hpk2rji13uj67HKxMQ9Ss8-axVOi5YH6OFmxxnvUPk-rQb_PN8NaM3yFL604FsVVyAtT1Mp1S2h1YShSRKCDWtBV2h0sLk3C3iKZdWsgo8AH64GgDRTZal9y4ewal2G4LbyuQwVfr1VJTZegdGOKKR7DX2PA"
}'

Handling the response

If the JWT is properly formed and your service has permission to perform the operation, then the JSON response from the authorization server should include an access token. The following is an example response.

{
  "access_token": "eyJhbGciOiJSUzI1NiIsImtpZCI6InNrSUJOZyJ9.eyJpc3MiOiJodHRwczovL2lkZW50aXR5dG9vbGtpdC5nb29nbGUuY29tLyIsImF1ZCI6ImRldi1na2UtN2E2NSIsImlhdCI6MTU3NjE4MDg4MSwiZXhwIjoxNTc3MzkwNDgxLCJ1c2VyX2lkIjoiY2FwaXRhb2FtZXJpY2FAcGlzbW8uaW8iLCJzaWduX2luX3Byb3ZpZGVyIjoiY3VzdG9tIiwiZXh0cmFfY2xhaW1zIjp7InRlc3QxIjoidGVzdDEiLCJ0ZXN0MiI6InRlc3QyIiwidGVzdDMiOiJ0ZXN0MyJ9fQ.LAv--CRbsZqDhlRXcpnZlyK403oU2i1__fFR7CZ-bgp5e4lF187r1W-9jpZCVLit-QhneHJiaySxlDTAiwYfUu6bpVPw0BaXT-GimmGi-MDudUX3R44VtdQPvOXUHgx43DDD1NsDOwDn5QtrA-pvrfyT-Ijs6GcH4R66XPYaIm_ASHSEPCupK0ZW6VFjiWx3goGtCKG-TQlaGyq-iQ_ZBRJksJf6xIN8bFC1HqODePm3yDbtum2hbxwuZGtBQ0DcgkH4in4TWKwe8qrk37cl5TOkRx1yyhh9Jkhigmu6NuTvCk6ic-aappIR2P9iBB-g3W33-HVutXqqWfd0DXQb5w",
  "refresh_token": "AE0u-NcsvZAKSuwq8Q4E7ZEE9NBmmio7-0JQASKqw8L2AWaFH9EIggs4wuzvE0nnVoC9",
  "expires_in": "3600"
}

📘
Access tokens expire after one hour
Your application should catch the error generated when this happens. It can then generate another JWT, sign it, and request another access token.

Calling Pismo APIs

After your application obtains an access token, you can use it to make calls to a Pismo API on behalf of the given user account. To do this, include the access token in the authorization: Bearer header of each request, as example below.

curl --request POST \
  --url https://sandbox.pismolabs.io/service/v1/service/example/payment \
  --header 'Content-Type: application/json' \
  --header 'accept: application/json' \
  --header 'authorization: Bearer eyJhbGciOiJSUzI1NiIsImtpZCI6InNrSUJOZyJ9.eyJpc3MiOiJodHRwczovL2lkZW50aXR5dG9vbGtpdC5nb29nbGUuY29tLyIsImF1ZCI6ImRldi1na2UtN2E2NSIsImlhdCI6MTU3NjE4MDg4MSwiZXhwIjoxNTc3MzkwNDgxLCJ1c2VyX2lkIjoiY2FwaXRhb2FtZXJpY2FAcGlzbW8uaW8iLCJzaWduX2luX3Byb3ZpZGVyIjoiY3VzdG9tIiwiZXh0cmFfY2xhaW1zIjp7InRlc3QxIjoidGVzdDEiLCJ0ZXN0MiI6InRlc3QyIiwidGVzdDMiOiJ0ZXN0MyJ9fQ.LAv--CRbsZqDhlRXcpnZlyK403oU2i1__fFR7CZ-bgp5e4lF187r1W-9jpZCVLit-QhneHJiaySxlDTAiwYfUu6bpVPw0BaXT-GimmGi-MDudUX3R44VtdQPvOXUHgx43DDD1NsDOwDn5QtrA-pvrfyT-Ijs6GcH4R66XPYaIm_ASHSEPCupK0ZW6VFjiWx3goGtCKG-TQlaGyq-iQ_ZBRJksJf6xIN8bFC1HqODePm3yDbtum2hbxwuZGtBQ0DcgkH4in4TWKwe8qrk37cl5TOkRx1yyhh9Jkhigmu6NuTvCk6ic-aappIR2P9iBB-g3W33-HVutXqqWfd0DXQb5w' \
  --data '{< JSON body the service expects to receive>}'

Authentication with OpenID Connect

Server authentication

📘

Generate your JWT

Using the JWT to request an access token

Handling the response

📘
Access tokens expire after one hour

Calling Pismo APIs

Server authentication

📘

Generate your JWT

Using the JWT to request an access token

Handling the response

📘Access tokens expire after one hour

Calling Pismo APIs

📘
Access tokens expire after one hour