# `Receipt.serialize` \[Serialize a Receipt to a string] Serializes a receipt to the Payment-Receipt header format. ## Usage ```ts twoslash import { Receipt } from 'mppx' const receipt = Receipt.from({ method: 'tempo', reference: '0x...', status: 'success', timestamp: new Date().toISOString(), }) const header = Receipt.serialize(receipt) // => "eyJzdGF0dXMiOiJzdWNjZXNzIiwidGltZXN0YW1wIjoi..." ``` ## Return type ```ts type ReturnType = string ``` A base64url-encoded string suitable for the Payment-Receipt header value. ## Parameters ### receipt * **Type:** `Receipt` The receipt to serialize.