backend old version request

src/app/pages/legacy-pay-page/legacy-pay-page.html

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+<div class="page">
+  <div class="card">
+
+    <div class="card__header">
+      <div class="sbp-logo">
+        <img src="https://sbp.nspk.ru/storage/settings/common/logo/0645d335-8b62-43a1-9a33-0d4c9d1dc0e0.svg"
+             alt="СБП" />
+      </div>
+      <h1 class="card__title">Оплата через СБП</h1>
+      <p class="card__subtitle">Система быстрых платежей</p>
+    </div>
+
+    <div class="card__body">
+
+      <div class="field">
+        <label class="field__label" for="amount">Сумма платежа</label>
+        <div class="input-wrap" [class.input-wrap--error]="error()">
+          <span class="input-wrap__prefix">₽</span>
+          <input
+            id="amount"
+            type="number"
+            class="input-wrap__input"
+            [ngModel]="amount()"
+            (ngModelChange)="onAmountChange($event)"
+            min="1"
+            step="1"
+            inputmode="numeric"
+            placeholder="0"
+            autofocus
+          />
+        </div>
+        @if (error()) {
+          <span class="field__error">{{ error() }}</span>
+        }
+      </div>
+
+      <div class="currency-badge">
+        <span class="currency-badge__flag">🇷🇺</span>
+        <span class="currency-badge__code">RUB</span>
+        <span class="currency-badge__name">Российский рубль</span>
+      </div>
+
+      <div class="field">
+        <label class="field__label" for="note">Примечание</label>
+        <textarea
+          id="note"
+          class="note-input"
+          [ngModel]="note()"
+          (ngModelChange)="onNoteChange($event)"
+          placeholder="Причина платежа..."
+          rows="3"
+          maxlength="500"
+        ></textarea>
+      </div>
+
+      <button class="pay-btn" type="button" (click)="pay()" [disabled]="loading()">
+        <span class="pay-btn__icon">
+          <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor"
+               stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round">
+            <rect x="1" y="4" width="22" height="16" rx="2" ry="2" />
+            <line x1="1" y1="10" x2="23" y2="10" />
+          </svg>
+        </span>
+        {{ loading() ? 'Подождите...' : 'Перейти к оплате' }}
+      </button>
+    </div>
+
+    <div class="card__footer">
+      <span class="secure-badge">
+        <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor"
+             stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+          <path d="M12 22s8-4 8-10V5l-8-3-8 3v7c0 6 8 10 8 10z" />
+        </svg>
+        Защищённое соединение
+      </span>
+    </div>
+  </div>
+</div>