#[no_mangle]
pub static TAG_PAYMENT_SECRET: u8 = lightning_invoice::constants::TAG_PAYMENT_SECRET;
+#[no_mangle]
+pub static TAG_PAYMENT_METADATA: u8 = lightning_invoice::constants::TAG_PAYMENT_METADATA;
+
#[no_mangle]
pub static TAG_FEATURES: u8 = lightning_invoice::constants::TAG_FEATURES;