created_at: core::time::Duration, expanded_key: &ExpandedKey, secp_ctx: &Secp256k1<T>
) -> Result<InvoiceBuilder<DerivedSigningPubkey>, SemanticError> {
if self.features().requires_unknown_bits() {
created_at: core::time::Duration, expanded_key: &ExpandedKey, secp_ctx: &Secp256k1<T>
) -> Result<InvoiceBuilder<DerivedSigningPubkey>, SemanticError> {
if self.features().requires_unknown_bits() {