payemnt billing and credits refactoring

backend/igny8_core/templates/emails/credit_invoice_cancelled.html

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+{% extends "emails/base.html" %}
+
+{% block content %}
+<h2>Invoice Cancelled</h2>
+<p>Hi {{ account_name }},</p>
+<p>Your credit invoice <strong>#{{ invoice_number }}</strong> was cancelled.</p>
+<p>
+  You can create a new credit purchase anytime from your billing page:
+  <a href="{{ invoice_url }}">Billing</a>
+</p>
+<p>If you have any questions, contact support at {{ support_email }}.</p>
+{% endblock %}

backend/igny8_core/templates/emails/credit_invoice_expired.html

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+{% extends "emails/base.html" %}
+
+{% block content %}
+<h2>Invoice Expired</h2>
+<p>Hi {{ account_name }},</p>
+<p>Your credit invoice <strong>#{{ invoice_number }}</strong> has expired and was voided.</p>
+<p>
+  You can create a new credit purchase anytime from your billing page:
+  <a href="{{ invoice_url }}">Billing</a>
+</p>
+<p>If you have any questions, contact support at {{ support_email }}.</p>
+{% endblock %}

backend/igny8_core/templates/emails/credit_invoice_expiring.html

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+{% extends "emails/base.html" %}
+
+{% block content %}
+<h2>Invoice Expiring Soon</h2>
+<p>Hi {{ account_name }},</p>
+<p>Your credit invoice <strong>#{{ invoice_number }}</strong> will expire soon.</p>
+<ul>
+  <li><strong>Amount:</strong> {{ currency }} {{ total_amount }}</li>
+  <li><strong>Expires at:</strong> {{ expires_at }}</li>
+</ul>
+<p>
+  Please complete payment before it expires:
+  <a href="{{ invoice_url }}">View Invoice</a>
+</p>
+<p>If you have any questions, contact support at {{ support_email }}.</p>
+{% endblock %}