# `Method.toServer` Extends a payment method with server-side verification logic. ## Usage ::::code-group ```ts twoslash [methods.server.ts] import { Mppx } from 'mppx/server' import { Method, Receipt } from 'mppx' // [!code focus] import * as Methods from './methods' // [!code focus] // [!code focus:start] // Create server-configured method. const charge = Method.toServer(Methods.charge, { async verify({ credential, request }) { return Receipt.from({ method: 'tempo', reference: '0x...', status: 'success', timestamp: new Date().toISOString(), }) }, }) // [!code focus:end] // Create Mppx server with the method configured. const mppx = Mppx.create({ methods: [charge], }) ``` ```ts twoslash [methods.ts] filename="methods.ts" import { Method, z } from 'mppx' export const charge = Method.from({ intent: 'charge', name: 'tempo', schema: { credential: { payload: z.object({ signature: z.string(), type: z.literal('transaction'), }), }, request: z.object({ amount: z.string(), currency: z.string(), recipient: z.string(), }), }, }) ``` :::: ## Return type ```ts type ReturnType = Method.Server ``` A server-configured method that can be passed to `Mppx.create`. ## Parameters ### method * **Type:** `Method` The base payment method definition (created with `Method.from`). ### options #### defaults (optional) * **Type:** `Partial` Default request parameters merged into every Challenge issued for this method. #### request (optional) * **Type:** `(options: { credential?: Credential; request: request }) => request` Transform function called before Challenge creation. Use to modify or enrich request parameters. #### respond (optional) * **Type:** `(parameters: { credential: Credential; input: Request; receipt: Receipt; request: request }) => Response | undefined` Called after `verify` succeeds. Return a `Response` to short-circuit the handler (for example, for channel open/close management responses). Return `undefined` to let the server handler serve content via `withReceipt(response)`. HTTP-only—MCP transports do not invoke this hook. #### transport (optional) * **Type:** `Transport` Override the transport for this method. #### verify * **Type:** `(parameters: { credential: Credential; request: request }) => Promise` Function that verifies a Credential and returns a Receipt.