Blank Page with "Something Went Wrong" Error When Accessing Square Checkout Link - Sandbox

I am using Square’s API to create a checkout link. The API request succeeds, and I receive a valid response, including the checkout URL. However, when I attempt to open the generated URL, I see a blank page with the error message: “Something went wrong”.

Code Snippet:

Below is the CreateCheckout function used to create the checkout link:

func CreateCheckout(amount int64, buyerEmail string) (*CreateCheckoutResponse, error) {
	idempotencyKey := uuid.NewString()

	var redirectURL string
	if config.Env.Environment == "development" {
		redirectURL = "http://localhost:4321/"
	} else {
		redirectURL = "{PROD_URL}"
	}

	reqBody := createCheckoutRequest{
		CheckoutOptions: checkoutOptions{
			AllowTipping:          false,
			AskForShippingAddress: false,
			EnableCoupon:          false,
			EnableLoyalty:         false,
			MerchantSupportEmail:  "support@{DOMAIN}",
			RedirectURL:           redirectURL,
		},
		IdempotencyKey: idempotencyKey,
		QuickPay: quickPay{
			LocationID: "{LOCATION_ID}",
			Name:       "Deposit",
			PriceMoney: priceMoney{
				Amount:   amount,
				Currency: "USD",
			},
		},
		PrePopulatedData: prePopulatedData{
			BuyerEmail: buyerEmail,
		},
	}

	data, err := json.Marshal(reqBody)
	if err != nil {
		return nil, fmt.Errorf("failed to marshal request body: %w", err)
	}

	var url string
	if config.Env.Environment == "development" {
		url = "https://connect.squareupsandbox.com/v2/online-checkout/payment-links"
	} else {
		url = "https://connect.squareup.com/v2/online-checkout/payment-links"
	}

	req, err := http.NewRequestWithContext(context.TODO(), http.MethodPost, url, bytes.NewBuffer(data))
	if err != nil {
		return nil, fmt.Errorf("failed to create request: %w", err)
	}

	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Square-Version", "2024-11-20")
	req.Header.Set("Authorization", "Bearer "+config.Env.SquareAccessToken)

	client := &http.Client{Timeout: 10 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		return nil, fmt.Errorf("request error: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode < 200 || resp.StatusCode > 299 {
		return nil, fmt.Errorf("received non-2xx response: %d", resp.StatusCode)
	}

	var result CreateCheckoutResponse
	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
		return nil, fmt.Errorf("failed to decode response: %w", err)
	}

	return &result, nil
}

Error Page Screenshot:

Issue Details:

1. The API request to create the checkout link returns a successful response with a 200 OK status code.
2. The returned URL appears valid.
3. When I visit the URL in a browser, I receive a “Something went wrong” error and the page remains blank.

I cannot continue development until this is solved, any help is appreciated thank you!

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