Saving transaction & customer info

internal/cards/cards.go

@@ -76,7 +76,7 @@ func (c *Card) RetrievePaymentIntent(id string) (*stripe.PaymentIntent, error) {
 func (c *Card) SubscribeToPlan(
 	cust *stripe.Customer,
 	plan, email, last4, cardType string,
-) (string, error) {
+) (*stripe.Subscription, error) {
 	stripeCustomerID := cust.ID
 	items := []*stripe.SubscriptionItemsParams{
 		{Plan: stripe.String(plan)},
@@ -92,9 +92,9 @@ func (c *Card) SubscribeToPlan(
 	params.AddExpand("latest_invoice.payment_intent")
 	subscription, err := subscription.New(params)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
-	return subscription.ID, nil
+	return subscription, nil
 }
 
 func (c *Card) CreateCustomer(pm, email string) (*stripe.Customer, string, error) {