Step by Step Guide to Building an Omnisend API Integration in Go

Introduction

Hey there, fellow Go enthusiast! Ready to dive into the world of email marketing automation? Today, we're going to build an integration with Omnisend's API. This powerhouse of a platform offers a ton of features for email, SMS, and push notifications, and we're going to tap into that goodness using Go. Buckle up!

Prerequisites

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

• Go installed on your machine (if not, head over to golang.org and sort that out)
• An Omnisend account with an API key (you can snag one from your account settings)

Got those? Great! Let's get coding.

Setting up the project

First things first, let's create a new Go project:

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

We'll need to grab a couple of dependencies:

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

Authentication

Omnisend uses API key authentication. Let's set that up:

package main

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

const (
    baseURL = "https://api.omnisend.com/v3"
    apiKey  = "your-api-key-here"
)

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

Making API requests

Now that we've got our client set up, let's make a simple request:

resp, err := client.R().
    SetResult(&YourResponseStruct{}).
    Get("/contacts")

if err != nil {
    // Handle error
}

// Use resp.Result().(*YourResponseStruct) to access the response

Implementing key Omnisend API endpoints

Let's implement a few key endpoints:

Contacts API

func getContacts(client *resty.Client) (*ContactsResponse, error) {
    var result ContactsResponse
    _, err := client.R().
        SetResult(&result).
        Get("/contacts")
    return &result, err
}

Campaigns API

func createCampaign(client *resty.Client, campaign Campaign) (*CampaignResponse, error) {
    var result CampaignResponse
    _, err := client.R().
        SetBody(campaign).
        SetResult(&result).
        Post("/campaigns")
    return &result, err
}

Events API

func trackEvent(client *resty.Client, event Event) error {
    _, err := client.R().
        SetBody(event).
        Post("/events")
    return err
}

Error handling and rate limiting

Always handle your errors, folks! And respect those rate limits:

if resp.StatusCode() == 429 {
    // We've hit the rate limit, back off and retry
    time.Sleep(time.Second * 5)
    // Retry the request
}

Testing the integration

Write some unit tests to keep your code robust:

func TestGetContacts(t *testing.T) {
    client := setupTestClient()
    contacts, err := getContacts(client)
    assert.NoError(t, err)
    assert.NotNil(t, contacts)
    // Add more assertions
}

Best practices and optimization

• Cache frequently accessed data to reduce API calls
• Use goroutines for concurrent requests (but be mindful of rate limits!)
• Implement exponential backoff for retries

Conclusion

And there you have it! You've just built a solid foundation for an Omnisend API integration in Go. Remember, this is just the beginning. Explore more endpoints, add more features, and most importantly, have fun with it!

Keep coding, keep learning, and may your email campaigns always hit the inbox. Happy hacking!