PP-12076 Improve guidance on naming payment links

Update the content on the page for creating a payment link so that
it has guidance on how to name a payment link, and strip back some
of the other text.

New content written by @alanmaddrell, reviewed by @NathanD-GDS and
approved by @Beth-Brown.

Some of the content that was on this page also appears on the page
for managing payment links, shared between them using an include.
Since the content on the two pages now differs, this include has
been deleted and the content that was in it has been directly
incorporated into the page for managing payment links (which has
the exact same content as it did before).

app/views/payment-links/index.njk

@@ -28,11 +28,19 @@
     }) }}
   {% endif %}
 
-  <p class="govuk-body">You can create a payment link so that users can make online payments to your service. Even if you don’t have a digital service, GOV.UK Pay can still take payments for you.</p>
-  <p class="govuk-body">It’s quick and easy to create a payment link and you don’t need any technical knowledge.</p>
-  <p class="govuk-body">The same payment link can be used by all users of your service.</p>
-
-  {% include "./_pre-filled-payment-moto-content.njk" %}
+  <p class="govuk-body">You can create payment links and send them to your users so they can pay you. The same payment
+    link can be used by all users of your service. You can create payment links without any technical knowledge.</p>
+  <p class="govuk-body">You can prefill the amount and reference fields or allow users to put them in. Learn <a
+    href="https://docs.payments.service.gov.uk/prefill_payment_links/" class="govuk-link">how to create prefilled
+    links</a>.</p>
+
+  <h2 class="govuk-heading-m">What to call your link</h2>
+  <p class="govuk-body">Make sure the payment link name describes exactly what the user is paying for, and can be
+    understood out of context. Use plain language and spell out acronyms in the description if necessary.</p>
+  <p class="govuk-body">Bad:</p>
+  <p class="govuk-body">R1</p>
+  <p class="govuk-body">Good:</p>
+  <p class="govuk-body">Pay for your registration on the Register of Overseas Entities (R1)</p>
 
   {{ govukButton({
       text: "Create a payment link",

app/views/payment-links/manage.njk

@@ -60,7 +60,26 @@
     {% endif %}
   </p>
 
-  {% include "./_pre-filled-payment-moto-content.njk" %}
+  <h2 class="govuk-heading-m">Create a prefilled payment link</h2>
+  <p class="govuk-body">You can create prefilled links to send to users with the amount and reference already filled
+    in. Learn <a href="https://docs.payments.service.gov.uk/prefill_payment_links/" class="govuk-link">how to create
+    prefilled links</a>.</p>
+
+  {% set telephonePaymentLinksHtml %}
+    If you want to take payment in a call centre or by post,
+    <a class="govuk-link" href="mailto:[email protected]" target="_top">
+      contact support
+    </a>
+    to request
+    <a href="https://docs.payments.service.gov.uk/moto_payments/#take-a-payment-over-the-phone-moto-payments" class="govuk-link">
+      MOTO (mail order telephone order) payment links
+    </a>
+    to be set up on your account.
+  {% endset %}
+
+  {{ govukInsetText({
+    html: telephonePaymentLinksHtml
+  }) }}
 
   {% if permissions.tokens_create %}
   <h2 class="govuk-heading-m">Add metadata for reconciliation and reporting</h2>