Add configurable LNbits invoice memos and pubkey metadata

Read INVOICE_MEMO_YEARLY and INVOICE_MEMO_LIFETIME from the environment
and pass the user pubkey in LNbits payment extra for invoice creation.

.env.example

@@ -20,6 +20,8 @@ LNBITS_INVOICE_KEY=your-lnbits-invoice-read-key
 PRICE_YEARLY_SATS=1000
 PRICE_LIFETIME_SATS=10000
 INVOICE_EXPIRY_MINUTES=30
+INVOICE_MEMO_YEARLY=Noderunners Relay yearly Access
+INVOICE_MEMO_LIFETIME=Noderunners Relay lifetime Access
 
 # --- Nostr ---
 RELAYS=wss://relay.azzamo.net,wss://nostr.azzamo.net,wss://wot.azzamo.net

cmd/nip05api/main.go

@@ -102,6 +102,8 @@ func run() error {
 				YearlySats:   cfg.Lightning.PriceYearlySats,
 				LifetimeSats: cfg.Lightning.PriceLifetimeSats,
 				ExpiryMins:   cfg.Lightning.InvoiceExpiryMins,
+				MemoYearly:   cfg.Lightning.InvoiceMemoYearly,
+				MemoLifetime: cfg.Lightning.InvoiceMemoLifetime,
 			}, cfg.Domain)
 	}
 

internal/config/config.go

@@ -16,6 +16,8 @@ type LightningConfig struct {
 	PriceYearlySats     int64
 	PriceLifetimeSats   int64
 	InvoiceExpiryMins   int
+	InvoiceMemoYearly   string
+	InvoiceMemoLifetime string
 }
 
 type NostrConfig struct {
@@ -83,6 +85,8 @@ func Load() (*Config, error) {
 			PriceYearlySats:     int64(envInt("PRICE_YEARLY_SATS", 1000)),
 			PriceLifetimeSats:   int64(envInt("PRICE_LIFETIME_SATS", 10000)),
 			InvoiceExpiryMins:   envInt("INVOICE_EXPIRY_MINUTES", 30),
+			InvoiceMemoYearly:   env("INVOICE_MEMO_YEARLY", "Noderunners Relay yearly Access"),
+			InvoiceMemoLifetime: env("INVOICE_MEMO_LIFETIME", "Noderunners Relay lifetime Access"),
 		},
 		Nostr: NostrConfig{
 			Relays:              csv(env("RELAYS", "")),

internal/invoice/lnbits.go

@@ -30,6 +30,7 @@ type createReq struct {
 	Amount int64             `json:"amount"`
 	Memo   string            `json:"memo"`
 	Expiry int               `json:"expiry,omitempty"`
+	Extra  map[string]string `json:"extra,omitempty"`
 }
 
 type createResp struct {
@@ -47,8 +48,8 @@ type statusResp struct {
 	} `json:"details"`
 }
 
-func (c *LNbitsClient) Create(ctx context.Context, amountSats int64, memo string, expirySecs int) (string, string, error) {
+func (c *LNbitsClient) Create(ctx context.Context, amountSats int64, memo string, expirySecs int, extra map[string]string) (string, string, error) {
-	body, err := json.Marshal(createReq{Out: false, Amount: amountSats, Memo: memo, Expiry: expirySecs})
+	body, err := json.Marshal(createReq{Out: false, Amount: amountSats, Memo: memo, Expiry: expirySecs, Extra: extra})
 	if err != nil {
 		return "", "", err
 	}

internal/invoice/service.go

@@ -20,6 +20,8 @@ type Pricing struct {
 	YearlySats   int64
 	LifetimeSats int64
 	ExpiryMins   int
+	MemoYearly   string
+	MemoLifetime string
 }
 
 type Service struct {
@@ -131,17 +133,15 @@ func (s *Service) Create(ctx context.Context, req CreateRequest) (*PendingInvoic
 	}
 
 	amount := s.pricing.YearlySats * int64(req.Years)
+	memo := s.pricing.MemoYearly
 	if req.SubscriptionType == user.SubLifetime {
 		amount = s.pricing.LifetimeSats
-	}
+		memo = s.pricing.MemoLifetime
-
-	memo := fmt.Sprintf("%s@%s", username, s.domain)
-	if isRenewal {
-		memo = "renewal: " + memo
 	}
 
 	expirySecs := s.pricing.ExpiryMins * 60
-	hash, request, err := s.lnbits.Create(ctx, amount, memo, expirySecs)
+	extra := map[string]string{"pubkey": req.Pubkey}
+	hash, request, err := s.lnbits.Create(ctx, amount, memo, expirySecs, extra)
 	if err != nil {
 		return nil, err
 	}