Fetching subscriptions returns empty array although there are subscriptions

[Tobi696]

Go function to fetch Subscriptions:

func FetchSubscriptions() ([]entities.Subscription, error) {
	var result []entities.Subscription
	ctx := context.TODO()
	subscriptions, err := goCardLessClient.Subscriptions.List(ctx, gocardless.SubscriptionListParams{Limit: 100})
	if err != nil {
		log.Println("Error in api.FetchSubscriptions 1:", err)
		return result, appjoy.ErrSomethingWentWrong
	}
	for _, subscription := range subscriptions.Subscriptions {
		var eSubscription entities.Subscription
		eSubscription.ID = subscription.Id
		switch subscription.IntervalUnit {
		case "weekly":
			eSubscription.Pricing = fmt.Sprintf("%d€ / w", subscription.Amount/1000)
		case "monthly":
			eSubscription.Pricing = fmt.Sprintf("%d€ / m", subscription.Amount/1000)
		}
		result = append(result, eSubscription)
	}

	return result, nil
}

Desired result: getting the subscriptions
Actual result: no error is returned, but the slice of Subscriptions is empty.