Step by Step Guide to Building a Klaviyo API Integration in Go

Introduction

Hey there, fellow Go enthusiast! Ready to supercharge your marketing automation? Let's dive into building a Klaviyo API integration in Go. Klaviyo's powerful API lets you manage lists, subscribers, and events with ease. We'll cover the essentials, so buckle up!

Prerequisites

Before we jump in, make sure you've got:

• Go installed (you're a Gopher, right?)
• A Klaviyo account with an API key
• Your favorite code editor

Setting up the project

Let's kick things off:

mkdir klaviyo-integration
cd klaviyo-integration
go mod init github.com/yourusername/klaviyo-integration

Now, let's grab the HTTP client we'll use:

go get github.com/go-resty/resty/v2

Authentication

Klaviyo uses API keys for authentication. Let's set that up:

package main

import (
    "github.com/go-resty/resty/v2"
)

const (
    baseURL = "https://a.klaviyo.com/api"
    apiKey  = "your-api-key-here"
)

func main() {
    client := resty.New().
        SetBaseURL(baseURL).
        SetHeader("Authorization", "Klaviyo-API-Key "+apiKey)

    // We'll use this client for all our requests
}

Basic API Requests

Let's try a GET request to fetch a list:

resp, err := client.R().
    SetResult(&ListResponse{}).
    Get("/v2/lists")

if err != nil {
    log.Fatalf("Error: %v", err)
}

lists := resp.Result().(*ListResponse)
fmt.Printf("Found %d lists\n", len(lists.Data))

And a POST to create a new list:

resp, err := client.R().
    SetBody(map[string]string{
        "list_name": "My Awesome List",
    }).
    Post("/v2/lists")

if err != nil {
    log.Fatalf("Error: %v", err)
}

fmt.Printf("List created with ID: %s\n", resp.String())

Implementing Key Klaviyo Features

Managing Lists

func getLists() ([]List, error) {
    // Implementation
}

func createList(name string) (string, error) {
    // Implementation
}

Adding/Removing Subscribers

func addSubscriber(listID, email string) error {
    // Implementation
}

func removeSubscriber(listID, email string) error {
    // Implementation
}

Sending Emails

func sendEmail(templateID string, recipients []string) error {
    // Implementation
}

Tracking Events

func trackEvent(event string, customerProperties map[string]interface{}) error {
    // Implementation
}

Error Handling and Rate Limiting

Klaviyo has rate limits, so let's be good citizens:

func rateLimitedClient() *resty.Client {
    return resty.New().
        SetBaseURL(baseURL).
        SetHeader("Authorization", "Klaviyo-API-Key "+apiKey).
        SetRetryCount(3).
        SetRetryWaitTime(5 * time.Second)
}

Testing

Here's a quick unit test example:

func TestGetLists(t *testing.T) {
    lists, err := getLists()
    assert.NoError(t, err)
    assert.NotEmpty(t, lists)
}

For integration tests, consider using a test API key and cleaning up after your tests.

Best Practices

1. Use structs to represent Klaviyo objects
2. Implement proper error handling
3. Use context for cancellation and timeouts
4. Cache frequently accessed data

Conclusion

And there you have it! You're now equipped to build a robust Klaviyo integration in Go. Remember, the Klaviyo API is vast, so don't hesitate to explore their docs for more advanced features. Happy coding, Gopher!