gateway_forms/mustache/payment_amount.html.mustache
<h3 class="amount_header">{{ l10n amount_label_key }}
<span id="amount_input" {{^ show_amount_input }}class="hidden"{{/ show_amount_input }} >
<input type="number" step="any" name="amount" id="amount" title="{{ donate_interface-amount }}" value="{{ amount }}" />
<select name="currency" id="currency" title="{{ donate_interface-currency }}" {{^ show_currency_selector }}class="hidden"{{/ show_currency_selector }} >
{{# currencies }}
<option value="{{ code }}" {{# selected }}selected{{/ selected }} >{{ code }}</option>
{{/ currencies }}
</select>
{{^ show_currency_selector }}
{{ currency }}
{{/ show_currency_selector }}
</span>
<span id="selected-amount" {{# show_amount_input }}class="hidden"{{/ show_amount_input }}>
{{ display_amount }}
</span>
</h3>