checkout

Checkout.com Golang SDK

Getting started

Version 2.0.0 is here!

We added comprehensive context.Context support across all SDK clients.
All client methods now have *WithContext variants for better timeout handling, cancellation support, and request lifecycle control.
Backward compatibility is maintained: existing methods continue to work by using context.Background() internally.

Module installer

Make sure your project is using Go Modules:

# For v2.x (current)
go get github.com/checkout/checkout-sdk-go/v2@v2.0.0

# For v1.x (legacy)
go get github.com/checkout/checkout-sdk-go@v1.9.0

Then import the library into your code:

# For v2.x
import "github.com/checkout/checkout-sdk-go/v2"

# For v1.x
import "github.com/checkout/checkout-sdk-go"

🚀 Please check in GitHub releases for all the versions available.

📖 Checkout our official documentation.

• Official Docs (Default)
• Official Docs (Previous)

📚 Check out our official API documentation guide, where you can also find more usage examples.

• API Reference (Default)
• API Reference (Previous)

How to use the SDK

This SDK can be used with two different pair of API keys provided by Checkout. However, using different API keys imply using specific API features.
Please find in the table below the types of keys that can be used within this SDK.

Note: sandbox keys have a sbox_ or test_ identifier, for Default and Previous accounts respectively.

If you don't have your own API keys, you can sign up for a test account here.

PLEASE NEVER SHARE OR PUBLISH YOUR CHECKOUT CREDENTIALS.

Default

Default keys client instantiation can be done as follows:

import (
    "github.com/checkout/checkout-sdk-go/v2"
    "github.com/checkout/checkout-sdk-go/v2/configuration"
)

api, err := checkout.Builder().
                     StaticKeys().
                     WithEnvironment(configuration.Sandbox()).
                     WithSecretKey("secret_key").
                     WithPublicKey("public_key"). // optional, only required for operations related with tokens
                     Build()

Default OAuth

The SDK supports client credentials OAuth, when initialized as follows:

import (
    "github.com/checkout/checkout-sdk-go/v2"
    "github.com/checkout/checkout-sdk-go/v2/configuration"
)

api, err := checkout.Builder().
                     OAuth().
                     WithAuthorizationUri("https://access.sandbox.checkout.com/connect/token"). // optional, custom authorization URI
                     WithClientCredentials("client_id", "client_secret").
                     WithEnvironment(configuration.Sandbox()).
                     WithScopes(getOAuthScopes()).
                     Build()

Previous

If your pair of keys matches the previous system type, this is how the SDK should be used:

import (
    "github.com/checkout/checkout-sdk-go/v2"
    "github.com/checkout/checkout-sdk-go/v2/configuration"
)

api, err := checkout.Builder().
                     Previous().
                     WithEnvironment(configuration.Sandbox()).
                     WithSecretKey("secret_key").
                     WithPublicKey("public_key"). // optional, only required for operations related with tokens
                     Build()

Then just get any client, and start making requests:

import (
    "github.com/checkout/checkout-sdk-go/v2/payments"
    "github.com/checkout/checkout-sdk-go/v2/payments/nas"
)

request := nas.PaymentRequest{}
response, err := api.Payments.RequestPayment(request)

Error Handling

All the API responses that do not fall in the 2** status codes will return a errors.CheckoutApiError. The error encapsulates the StatusCode, Status and a the ErrorDetails, if available.

Custom Http Client

Go SDK supports your own configuration for http client using http.Client from the standard library. You can pass it through when instantiating the SDK as follows:

import (
    "net/http"
    
    "github.com/checkout/checkout-sdk-go/v2"
    "github.com/checkout/checkout-sdk-go/v2/configuration"
)

httpClient := http.Client{
    Timeout: time.Duration(20) * time.Millisecond,
}

api, err := checkout.Builder().
                     StaticKeys().
                     WithEnvironment(configuration.Sandbox()).
                     WithHttpClient(&httpClient).
                     WithSecretKey("secret_key")).
                     WithPublicKey("public_key")). // optional, only required for operations related with tokens
                     Build()

Logging

The SDK supports custom Log provider. You can provide your log configuration via SDK initialization. By default, the SDK uses the log package from the standard library.

import (
    "log"	
	
    "github.com/checkout/checkout-sdk-go/v2"
    "github.com/checkout/checkout-sdk-go/v2/configuration"
)

logger := log.New(os.Stderr, "checkout-sdk-go - ", log.LstdFlags)

api, err := checkout.Builder().
                     StaticKeys().
                     WithEnvironment(configuration.Sandbox()).
                     WithSecretKey("secret_key")).
                     WithPublicKey("public_key")). // optional, only required for operations related with tokens
                     WithLogger(logger) // your own custom configuration
                     Build()

Custom Environment

In case that you want to use an integrator or mock server, you can specify your own URI configuration as follows:

import (
    "github.com/checkout/checkout-sdk-go/v2"
    "github.com/checkout/checkout-sdk-go/v2/configuration"
)

environment := configuration.NewEnvironment(
	"https://the.base.uri/", // the uri for all CKO operations
	"https://the.oauth.uri/connect/token", // the uri used for OAUTH authorization, only required for OAuth operations
	"https://the.files.uri/", // the uri used for Files operations, only required for Accounts module
	"https://the.transfers.uri/", // the uri used for Transfer operations, only required for Transfers module
	"https://the.balances.uri/", // the uri used for Balances operations, only required for Balances module
	"https://the.forward.uri/", // the uri used for Forward operations, only required for Forward module
	"https://the.identity.uri/", // the uri used for Identity operations, only required for Identity modules (applicants, identity-verifications, aml-verifications, face-authentications, id-document-verifications)
	false, // isSandbox
)

api, err := checkout.Builder().
                     StaticKeys().
                     WithEnvironment(environment).
                     WithSecretKey("secret_key")).
                     WithPublicKey("public_key")). // optional, only required for operations related with tokens
                     Build()

Building from source

Once you check out the code from GitHub, the project can be built using:

go mod tidy

go build

The execution of integration tests require the following environment variables set in your system:

• For default account systems (NAS): CHECKOUT_DEFAULT_PUBLIC_KEY & CHECKOUT_DEFAULT_SECRET_KEY
• For default account systems (OAuth): CHECKOUT_DEFAULT_OAUTH_CLIENT_ID & CHECKOUT_DEFAULT_OAUTH_CLIENT_SECRET
• For Previous account systems (ABC): CHECKOUT_PREVIOUS_PUBLIC_KEY & CHECKOUT_PREVIOUS_SECRET_KEY

Telemetry

Request telementry is enabled by default in the Go SDK. Request latency is included in the telemetry data. Recording the request latency allows Checkout.com to continuously monitor and imporove the merchant experience.

Request telemetry can be disabled by opting out during checkout_sdk_builder builder step:

api := checkout.Builder().
    Previous().
    WithSecretKey("CHECKOUT_PREVIOUS_SECRET_KEY").
    WithEnvironment(configuration.Sandbox()).
    WithEnableTelemetry(false).
    Build()

Code of Conduct

Please refer to Code of Conduct

Licensing

MIT