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This email template includes invoice payment links that you can make available in the email to allow customers to pay an invoice without having to login to their client account. Each invoice available in the {invoices} tag includes a payment_url field that uniquely identifies the invoice to be paid. You can iterate over each invoice in the template to set the link. Consider the following example where invoice information is set, encapsulated in a for loop:

{% for invoice in invoices %}
Invoice ID: {invoice.id_code}
Amount Due: {invoice.due}
Pay now at https://{invoice.payment_url}.
{% endfor %}