Notice in the docs about "default checkout URL"

[GoodM4ven]

Greetings,

If the the default payment link isn't set in Paddle's checkout settings, then the moment the subscription button ($checkout's) is clicked, and where the overlay is used, the payment overlay will show a vague "please contact support" sort of message, and JS will throw this transaction_default_checkout_url_not_set error; which can only be seen upon dev-tools inspection.

I suggest adding a bold warning in the docs somewhere about this.

Thank you.

[Dries Vints]

Thanks! I added this here: laravel/docs#9211