+#[cfg_attr(test, derive(PartialEq))]
+pub(super) struct PayerContents(pub Metadata);
+
+/// TLV record type for [`InvoiceRequest::metadata`] and [`Refund::metadata`].
+///
+/// [`InvoiceRequest::metadata`]: crate::offers::invoice_request::InvoiceRequest::metadata
+/// [`Refund::metadata`]: crate::offers::refund::Refund::metadata
+pub(super) const PAYER_METADATA_TYPE: u64 = 0;