Guust

The “Pay for Invoice” link on the Invoice should not go to a 503, but the /wpi-checkout/ page.

Ideally, I guess that link should not be there on an invoice that is to be paid with a bank transfer or the sending of a cheque.

If we need to investigate why your setup goes to a 503 page, post your WP admin details in a private reply and we will have a look for you.

I will also get the developers to have a look at the question whether the “Pay for Invoice” link should be there and/or that link can be customized to go to a different URL than the /wpi-checkout/ page.

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Your WP Invoicing WP Affiliate integration plugin is not active [Invoicing – AffiliateWP Integration].
If you activate that then you will have a new option at Affiliates > Settings to tick “Invoicing”, see also https://wpinvoicing.com/docs/affiliate-wp/

I have activated the plugin and connected Invoicing and WP Affiliates.

You will need to add the referral rates to the GD packages at Invoicing > Items > Edit each package.

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Have a look at
Invoicing > Settings > Misc > Miscellaneous

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You can make the field not required at
Invoicing > Settings > Misc tab > Fields.

Let us know if that solves the issue.

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If you are already using Stripe with V1, you should already be using WPinvoicing and the Stripe addon …

If you were using a very old version of the Stripe GD addon, you will have to change your webhook, yes.

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Yes, that is correct. The subscription will not be set up correctly until the first invoice is paid, and therefore the subscription only starts running when the first invoice is paid.
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You can delete the invoice and create a new invoice.
You cannot delete items from an invoice.
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