Add improved non-UMA LNURL compatibility

uma/payee_data.go

@@ -32,7 +32,7 @@ type CompliancePayeeData struct {
 	// Utxos is a list of UTXOs of channels over which the receiver will likely receive the payment.
 	Utxos []string `json:"utxos"`
 	// UtxoCallback is the URL that the sender VASP will call to send UTXOs of the channel that the sender used to send the payment once it completes.
-	UtxoCallback string `json:"utxoCallback"`
+	UtxoCallback *string `json:"utxoCallback"`
 	// Signature is the base64-encoded signature of sha256(SenderAddress|ReceiverAddress|Nonce|Timestamp).
 	Signature string `json:"signature"`
 	// Nonce is a random string that is used to prevent replay attacks.

uma/payer_data.go

@@ -108,3 +108,16 @@ type CompliancePayerData struct {
 	// UtxoCallback is the URL that the receiver will call to send UTXOs of the channel that the receiver used to receive the payment once it completes.
 	UtxoCallback string `json:"utxoCallback"`
 }
+
+func (c *CompliancePayerData) AsMap() (map[string]interface{}, error) {
+	complianceJson, err := json.Marshal(c)
+	if err != nil {
+		return nil, err
+	}
+	var complianceMap map[string]interface{}
+	err = json.Unmarshal(complianceJson, &complianceMap)
+	if err != nil {
+		return nil, err
+	}
+	return complianceMap, nil
+}