{% extends "withnav_template.html" %}
{% from "components/textbox.html" import textbox %}
{% from "components/page-header.html" import page_header %}
{% from "components/page-footer.html" import page_footer %}
{% from "components/form.html" import form_wrapper %}

{% block service_page_title %}
  Callbacks for delivery receipts
{% endblock %}

{% block maincolumn_content %}
  <div class="grid-row">
    <div class="column-five-sixths">

      {{ page_header(
        'Callbacks for delivery receipts',
        back_link=url_for(back_link, service_id=current_service.id)
      ) }}

      <p>
        When you send an email or text message, we can tell you if Notify was able to deliver it.
        Read the Callbacks section of the <a href="{{ url_for('main.documentation') }}">documentation</a> for more information.
      </p>

      {% call form_wrapper() %}
        {{ textbox(
          form.url,
          width='1-1',
          hint='Must start with https://'
        ) }}
        {{ textbox(
          form.bearer_token,
          width='1-1',
          hint='At least 10 characters',
          autocomplete='new-password'
        ) }}
        {{ page_footer('Save') }}
      {% endcall %}
    </div>
  </div>

{% endblock %}

{% extends "withnav_template.html" %}
{% from "components/textbox.html" import textbox %}
{% from "components/page-header.html" import page_header %}
{% from "components/page-footer.html" import page_footer %}
{% from "components/form.html" import form_wrapper %}

{% block service_page_title %}
  Callbacks for delivery receipts
{% endblock %}

{% block maincolumn_content %}
  <div class="grid-row">
    <div class="column-five-sixths">

      {{ page_header(
        'Callbacks for delivery receipts',
        back_link=url_for(back_link, service_id=current_service.id)
      ) }}

      <p>
        When you send an email or text message, we can tell you if Notify was able to deliver it.
        Read the Callbacks section of the <a href="{{ url_for('main.documentation') }}">API documentation</a> for more information.
      </p>

      {% call form_wrapper() %}
        {{ textbox(
          form.url,
          width='1-1',
          hint='Must start with https://'
        ) }}
        {{ textbox(
          form.bearer_token,
          width='1-1',
          hint='At least 10 characters',
          autocomplete='new-password'
        ) }}
        {{ page_footer('Save') }}
      {% endcall %}
    </div>
  </div>

{% endblock %}

Add 'API' to the link for clarity
Add 'API' to the link for clarity