diff --git a/app/javascript/mastodon/features/donate/api.ts b/app/javascript/mastodon/features/donate/api.ts
deleted file mode 100644
index 4ed80e843ff..00000000000
--- a/app/javascript/mastodon/features/donate/api.ts
+++ /dev/null
@@ -1,94 +0,0 @@
-import { useEffect, useState } from 'react';
-
-import initialState from '@/mastodon/initial_state';
-
-// TODO: Proxy this through at least an env var.
-const API_URL = 'https://api.joinmastodon.org/v1/donations/campaigns/active';
-
-export const DONATION_FREQUENCIES = ['one_time', 'monthly', 'yearly'] as const;
-export type DonationFrequency = (typeof DONATION_FREQUENCIES)[number];
-
-export const LOCALE = initialState?.meta.locale ?? 'en';
-
-export function useDonateApi() {
-  const [response, setResponse] = useState<DonateServerResponse | null>(null);
-
-  const [seed, setSeed] = useState(0);
-  useEffect(() => {
-    try {
-      const storedSeed = localStorage.getItem('donate_seed');
-      if (storedSeed) {
-        setSeed(Number.parseInt(storedSeed, 10));
-        return;
-      }
-      const newSeed = Math.floor(Math.random() * 99) + 1;
-      localStorage.setItem('donate_seed', newSeed.toString());
-      setSeed(newSeed);
-    } catch {
-      // No local storage available, just set a seed for this session.
-      setSeed(Math.floor(Math.random() * 99) + 1);
-    }
-  }, []);
-
-  useEffect(() => {
-    if (!seed) {
-      return;
-    }
-    fetchCampaign({ locale: LOCALE, seed })
-      .then((res) => {
-        setResponse(res);
-      })
-      .catch((reason: unknown) => {
-        console.warn('Error fetching donation campaign:', reason);
-      });
-  }, [seed]);
-
-  return response;
-}
-
-export interface DonateServerResponse {
-  id: string;
-  amounts: Record<DonationFrequency, DonateAmount>;
-  donation_url: string;
-  banner_message: string;
-  banner_button_text: string;
-  donation_message: string;
-  donation_button_text: string;
-  donation_success_post: string;
-  default_currency: string;
-}
-
-export interface DonateCheckoutArgs {
-  frequency: DonationFrequency;
-  amount: number;
-  currency: string;
-}
-
-type DonateAmount = Record<string, number[]>;
-
-async function fetchCampaign(
-  params: DonateServerRequest,
-): Promise<DonateServerResponse | null> {
-  // Create the URL with query parameters.
-  const url = new URL(API_URL);
-  for (const [key, value] of Object.entries(params)) {
-    // Check to make TS happy.
-    if (typeof value === 'string' || typeof value === 'number') {
-      url.searchParams.append(key, value.toString());
-    }
-  }
-  url.searchParams.append('platform', 'android');
-  url.searchParams.append('source', 'menu');
-
-  const response = await fetch(url);
-  if (!response.ok) {
-    return null;
-  }
-  return response.json() as Promise<DonateServerResponse>;
-}
-
-interface DonateServerRequest {
-  locale: string;
-  seed: number;
-  return_url?: string;
-}
diff --git a/app/javascript/mastodon/features/donate/checkout.tsx b/app/javascript/mastodon/features/donate/checkout.tsx
new file mode 100644
index 00000000000..10da37c6140
--- /dev/null
+++ b/app/javascript/mastodon/features/donate/checkout.tsx
@@ -0,0 +1,27 @@
+import type { FC } from 'react';
+
+import { FormattedMessage } from 'react-intl';
+
+import { LoadingIndicator } from '@/mastodon/components/loading_indicator';
+
+export const DonateCheckoutHint: FC<{ donateUrl?: string }> = ({
+  donateUrl,
+}) => {
+  if (!donateUrl) {
+    return <LoadingIndicator />;
+  }
+  return (
+    <FormattedMessage
+      id='donate.checkout.instructions'
+      defaultMessage="Your checkout session is opened in another tab. If you don't see it, <link>click here</link>."
+      values={{
+        link: (chunks) => (
+          <a href={donateUrl} target='_blank' rel='noopener'>
+            {chunks}
+          </a>
+        ),
+      }}
+      tagName='p'
+    />
+  );
+};
diff --git a/app/javascript/mastodon/features/donate/donate_modal.scss b/app/javascript/mastodon/features/donate/donate_modal.scss
index d64a42520da..29eda7aec37 100644
--- a/app/javascript/mastodon/features/donate/donate_modal.scss
+++ b/app/javascript/mastodon/features/donate/donate_modal.scss
@@ -76,11 +76,18 @@
 
   .submit {
     padding: 0.6rem 1rem;
+
+    > svg {
+      height: 1em;
+    }
   }
 
   button > svg {
     fill: currentColor;
-    height: 1em;
+  }
+
+  .muted {
+    color: var(--input-placeholder-color);
   }
 
   .footer {
@@ -91,15 +98,15 @@
 
   .success {
     .illustration {
+      width: 100%;
       max-width: 350px;
       margin: 0 auto 1rem;
     }
 
     h2 {
-      font-size: 16px;
-      line-height: 24px;
+      font-size: 1.4rem;
+      line-height: 1;
       font-weight: 500;
-      letter-spacing: 0.15px;
     }
   }
 }
diff --git a/app/javascript/mastodon/features/donate/donate_modal.tsx b/app/javascript/mastodon/features/donate/donate_modal.tsx
index b6a4751e212..acd30881f47 100644
--- a/app/javascript/mastodon/features/donate/donate_modal.tsx
+++ b/app/javascript/mastodon/features/donate/donate_modal.tsx
@@ -5,12 +5,12 @@ import { defineMessages, useIntl } from 'react-intl';
 
 import classNames from 'classnames';
 
+import type { DonationFrequency } from '@/mastodon/api_types/donate';
 import { IconButton } from '@/mastodon/components/icon_button';
-import { LoadingIndicator } from '@/mastodon/components/loading_indicator';
+import { useAppSelector } from '@/mastodon/store';
 import CloseIcon from '@/material-icons/400-24px/close.svg?react';
 
-import type { DonateCheckoutArgs } from './api';
-import { useDonateApi } from './api';
+import { DonateCheckoutHint } from './checkout';
 import { DonateForm } from './form';
 import { DonateSuccess } from './success';
 
@@ -20,6 +20,12 @@ interface DonateModalProps {
   onClose: () => void;
 }
 
+export interface DonateCheckoutArgs {
+  frequency: DonationFrequency;
+  amount: number;
+  currency: string;
+}
+
 const messages = defineMessages({
   close: { id: 'lightbox.close', defaultMessage: 'Close' },
 });
@@ -31,9 +37,9 @@ const CHECKOUT_URL = 'http://localhost:3001/donate/checkout';
 const DonateModal: FC<DonateModalProps> = forwardRef(({ onClose }, ref) => {
   const intl = useIntl();
 
-  const donationData = useDonateApi() ?? undefined;
+  const donationData = useAppSelector((state) => state.donate.apiResponse);
 
-  const [donateUrl, setDonateUrl] = useState<null | string>(null);
+  const [donateUrl, setDonateUrl] = useState<string | undefined>();
   const handleCheckout = useCallback(
     ({ frequency, amount, currency }: DonateCheckoutArgs) => {
       const params = new URLSearchParams({
@@ -85,37 +91,15 @@ const DonateModal: FC<DonateModalProps> = forwardRef(({ onClose }, ref) => {
           />
         </header>
         <div
-          className={classNames('dialog-modal__content__form', {
+          className={classNames('dialog-modal__content__form', 'body', {
             initial: state === 'start',
             checkout: state === 'checkout',
             success: state === 'success',
           })}
         >
-          {state === 'start' &&
-            (donationData ? (
-              <DonateForm data={donationData} onSubmit={handleCheckout} />
-            ) : (
-              <LoadingIndicator />
-            ))}
-          {state === 'checkout' && (
-            <p>
-              Your session is opened in another tab.
-              {donateUrl && (
-                <>
-                  {' '}
-                  If you don&apos;t see it,
-                  {/* eslint-disable-next-line react/jsx-no-target-blank -- We want access to the opener in order to detect success. */}
-                  <a href={donateUrl} target='_blank'>
-                    click here
-                  </a>
-                  .
-                </>
-              )}
-            </p>
-          )}
-          {state === 'success' && donationData && (
-            <DonateSuccess data={donationData} onClose={onClose} />
-          )}
+          {state === 'start' && <DonateForm onSubmit={handleCheckout} />}
+          {state === 'checkout' && <DonateCheckoutHint donateUrl={donateUrl} />}
+          {state === 'success' && <DonateSuccess onClose={onClose} />}
         </div>
       </div>
     </div>
diff --git a/app/javascript/mastodon/features/donate/form.tsx b/app/javascript/mastodon/features/donate/form.tsx
index 99243b22ba2..4ac541eba31 100644
--- a/app/javascript/mastodon/features/donate/form.tsx
+++ b/app/javascript/mastodon/features/donate/form.tsx
@@ -5,17 +5,16 @@ import { defineMessages, FormattedMessage, useIntl } from 'react-intl';
 
 import classNames from 'classnames';
 
+import type { DonationFrequency } from '@/mastodon/api_types/donate';
 import type { ButtonProps } from '@/mastodon/components/button';
 import { Button } from '@/mastodon/components/button';
 import { Dropdown } from '@/mastodon/components/dropdown';
 import type { SelectItem } from '@/mastodon/components/dropdown_selector';
+import { LoadingIndicator } from '@/mastodon/components/loading_indicator';
+import { useAppSelector } from '@/mastodon/store';
 import ExternalLinkIcon from '@/material-icons/400-24px/open_in_new.svg?react';
 
-import type {
-  DonateCheckoutArgs,
-  DonateServerResponse,
-  DonationFrequency,
-} from './api';
+import type { DonateCheckoutArgs } from './donate_modal';
 
 const messages = defineMessages({
   one_time: { id: 'donate.frequency.one_time', defaultMessage: 'Just once' },
@@ -24,16 +23,14 @@ const messages = defineMessages({
 });
 
 interface DonateFormProps {
-  data?: DonateServerResponse;
   onSubmit: (args: DonateCheckoutArgs) => void;
 }
 
-export const DonateForm: FC<Required<DonateFormProps>> = ({
-  data,
-  onSubmit,
-}) => {
+export const DonateForm: FC<Required<DonateFormProps>> = ({ onSubmit }) => {
   const intl = useIntl();
 
+  const donateData = useAppSelector((state) => state.donate.apiResponse);
+
   const [frequency, setFrequency] = useState<DonationFrequency>('one_time');
   const handleFrequencyToggle = useCallback((value: DonationFrequency) => {
     return () => {
@@ -41,18 +38,21 @@ export const DonateForm: FC<Required<DonateFormProps>> = ({
     };
   }, []);
 
-  const [currency, setCurrency] = useState<string>(data.default_currency);
+  const [currency, setCurrency] = useState<string>(
+    donateData?.default_currency ?? 'EUR',
+  );
   const currencyOptions: SelectItem[] = useMemo(
     () =>
-      Object.keys(data.amounts.one_time).map((code) => ({
+      Object.keys(donateData?.amounts.one_time ?? []).map((code) => ({
         value: code,
         text: code,
       })),
-    [data.amounts],
+    [donateData?.amounts],
   );
 
   const [amount, setAmount] = useState(
-    () => data.amounts[frequency][data.default_currency]?.[0] ?? 1000,
+    () =>
+      donateData?.amounts[frequency][donateData.default_currency]?.[0] ?? 1000,
   );
   const handleAmountChange = useCallback((event: SyntheticEvent) => {
     let newAmount = 1;
@@ -69,29 +69,35 @@ export const DonateForm: FC<Required<DonateFormProps>> = ({
       currency,
       maximumFractionDigits: 0,
     });
-    return Object.values(data.amounts[frequency][currency] ?? {}).map(
+    return Object.values(donateData?.amounts[frequency][currency] ?? {}).map(
       (value) => ({
         value: value.toString(),
         text: formatter.format(value / 100),
       }),
     );
-  }, [currency, data.amounts, frequency]);
+  }, [currency, donateData?.amounts, frequency]);
 
   const handleSubmit = useCallback(() => {
     onSubmit({ frequency, amount, currency });
   }, [amount, currency, frequency, onSubmit]);
 
+  if (!donateData) {
+    return <LoadingIndicator />;
+  }
+
   return (
     <>
       <div className='row'>
-        {(Object.keys(data.amounts) as DonationFrequency[]).map((freq) => (
-          <ToggleButton
-            key={freq}
-            active={frequency === freq}
-            onClick={handleFrequencyToggle(freq)}
-            text={intl.formatMessage(messages[freq])}
-          />
-        ))}
+        {(Object.keys(donateData.amounts) as DonationFrequency[]).map(
+          (freq) => (
+            <ToggleButton
+              key={freq}
+              active={frequency === freq}
+              onClick={handleFrequencyToggle(freq)}
+              text={intl.formatMessage(messages[freq])}
+            />
+          ),
+        )}
       </div>
 
       <div className='row row--select'>
diff --git a/app/javascript/mastodon/features/donate/success.tsx b/app/javascript/mastodon/features/donate/success.tsx
index 5c128ce7cad..a9d276937fc 100644
--- a/app/javascript/mastodon/features/donate/success.tsx
+++ b/app/javascript/mastodon/features/donate/success.tsx
@@ -4,29 +4,23 @@ import type { FC } from 'react';
 import { FormattedMessage } from 'react-intl';
 
 import donateIllustration from '@/images/donation_successful.png';
-import { focusCompose, resetCompose } from '@/mastodon/actions/compose';
+import { composeDonateShare } from '@/mastodon/actions/donate';
 import { Button } from '@/mastodon/components/button';
 import { useAppDispatch, useAppSelector } from '@/mastodon/store';
 import ShareIcon from '@/material-icons/400-24px/share.svg?react';
 
-import type { DonateServerResponse } from './api';
-
 interface DonateSuccessProps {
-  data: DonateServerResponse;
   onClose: () => void;
 }
 
-export const DonateSuccess: FC<DonateSuccessProps> = ({ data, onClose }) => {
+export const DonateSuccess: FC<DonateSuccessProps> = ({ onClose }) => {
   const hasComposerContent = useAppSelector(
     (state) => !!state.compose.get('text'),
   );
   const dispatch = useAppDispatch();
   const handleShare = useCallback(() => {
-    const shareText = data.donation_success_post;
-    dispatch(resetCompose());
-    dispatch(focusCompose(shareText));
-    onClose();
-  }, [data.donation_success_post, dispatch, onClose]);
+    dispatch(composeDonateShare());
+  }, [dispatch]);
 
   return (
     <>
@@ -41,11 +35,12 @@ export const DonateSuccess: FC<DonateSuccessProps> = ({ data, onClose }) => {
         defaultMessage='Thanks for your donation!'
         tagName='h2'
       />
-      <FormattedMessage
-        id='donate.success.subtitle'
-        defaultMessage='You should receive an email confirming your donation soon.'
-        tagName='p'
-      />
+      <p className='muted'>
+        <FormattedMessage
+          id='donate.success.subtitle'
+          defaultMessage='You should receive an email confirming your donation soon.'
+        />
+      </p>
 
       <Button block onClick={handleShare}>
         <ShareIcon />