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

Aug 12, 2024 • 6 minute read

Introduction

Hey there, fellow Go enthusiast! Ready to dive into the world of Keap API integration? You're in for a treat. Keap's API is a powerhouse for CRM and marketing automation, and we're about to harness that power with our favorite language: Go. Let's build something awesome together!

Prerequisites

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

Go installed (I know you do, but just checking!)
Keap API credentials (if you don't have these yet, hop over to Keap's developer portal)
Your favorite Go IDE fired up and ready to roll

Setting up the project

Let's get our project structure sorted:

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

Easy peasy, right? Now we're ready to start coding!

Authentication

Keap uses OAuth 2.0, so let's tackle that first:

import (
    "golang.org/x/oauth2"
)

// Set up your OAuth2 config
config := &oauth2.Config{
    ClientID:     "your-client-id",
    ClientSecret: "your-client-secret",
    Endpoint:     oauth2.Endpoint{
        AuthURL:  "https://accounts.infusionsoft.com/app/oauth/authorize",
        TokenURL: "https://api.infusionsoft.com/token",
    },
    RedirectURL: "http://localhost:8080/callback",
    Scopes:      []string{"full"},
}

// Implement token storage and refresh logic here

Pro tip: Store those tokens securely and implement a refresh mechanism. Your future self will thank you!

Making API requests

Time to create our API client:

type KeapClient struct {
    httpClient *http.Client
    baseURL    string
}

func NewKeapClient(httpClient *http.Client) *KeapClient {
    return &KeapClient{
        httpClient: httpClient,
        baseURL:    "https://api.infusionsoft.com/crm/rest/v1",
    }
}

func (c *KeapClient) Get(endpoint string) (*http.Response, error) {
    // Implement GET request logic
}

// Implement other HTTP methods (POST, PUT, DELETE) as needed

Don't forget to handle rate limiting and retries. Keap's API will love you for it!

Implementing key Keap API endpoints

Let's tackle some core endpoints:

func (c *KeapClient) GetContact(id int) (*Contact, error) {
    // Implement contact retrieval
}

func (c *KeapClient) CreateOpportunity(opp *Opportunity) (*Opportunity, error) {
    // Implement opportunity creation
}

// Implement other endpoints for companies, invoices, etc.

Error handling and logging

Robust error handling is your best friend:

import "github.com/sirupsen/logrus"

func (c *KeapClient) handleError(resp *http.Response) error {
    if resp.StatusCode >= 400 {
        logrus.Errorf("API error: %s", resp.Status)
        // Parse and return detailed error
    }
    return nil
}

Testing the integration

Time to put our code through its paces:

func TestGetContact(t *testing.T) {
    // Implement your test
}

func TestCreateOpportunity(t *testing.T) {
    // Implement your test
}

Don't skimp on testing – it's your safety net!

Best practices and optimization

Implement caching for frequently accessed data
Use goroutines for concurrent requests (but be mindful of rate limits!)
Keep your code modular and easy to extend

Conclusion

And there you have it! You've just built a solid foundation for your Keap API integration in Go. Remember, this is just the beginning. There's a whole world of Keap API endpoints to explore and integrate.

Keep coding, keep learning, and most importantly, have fun with it! Go's concurrency features make it a perfect match for API integrations like this.

Resources

Now go forth and build amazing things with your new Keap integration! 🚀