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For checkout flows where the amount is predetermined (subscription top-ups, fixed-price checkout, one-click refills), set fixedFromAmount to lock the widget’s amount input to a single USD value.

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The fixedFromAmount option

fixedFromAmount lives inside routes.options in your TrustwareConfigOptions. When it is set, the amount input in the widget becomes read-only and displays the value you provide. 
import { type TrustwareConfigOptions } from "@trustware/sdk";

const fixedAmountConfig = {
  ...trustwareConfig,
  routes: {
    ...trustwareConfig.routes,
    options: {
      fixedFromAmount: "25",
    },
  },
} satisfies TrustwareConfigOptions;
Pass this config to TrustwareProvider: 
<TrustwareProvider config={fixedAmountConfig}>
  <TrustwareWidget />
</TrustwareProvider>

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Value format

fixedFromAmount accepts a string or a number representing a USD amount: 
fixedFromAmount: "25"   // string: "25 USD"
fixedFromAmount: 25     // number: equivalent
The value is interpreted as a USD amount. Do not include a currency symbol or unit suffix.
When fixedFromAmount is set, the widget amount input is locked. Users can still select their source token, but they cannot modify the deposit amount.