Why does cart contents page not show a pay now button?

-- HikaShop version -- : 4.7.3
-- Joomla version -- : 4

If you go here, you'll see all the issues I refer to in this post. jimg57.sg-host.com/en/buy-boat-lifeline-...nline/checkout/cid-1
In the cart module, I turned on "Proceed." So now the cart contents page leads user to PayPal checkout as expected. Then, there are some funky things which need to be addressed.
There is no place to enter my card number. Why not?
I see these errors:
The Width is missing for the product Stanchions
The Length is missing for the product Stanchions
The Height is missing for the product Stanchions
None of those variables is material. How do I turn them off? In the product, I set all dimensions to zero because they don't matter. Does the system expect to see an integer there? Should I just enter numeral 1?
Another error says "no available warehouse for your location." This client has no warehouse anywhere. Again I see the product has a "warehouse" field. It is of no use. How do I make the error go away?
The "finish" button's positioned at bottom extreme right of the page is going to be missed by a lot of users. They just won't see it. It is just confusing. I remember this from years past. How do I move it to bottom left and make it read "Pay Now"? If that is what it does? If user clicks on Finish, should that be taking me to card entry? I keep wondering why there is no card entry field. Is that due to a setting over in the PayPal Checkout account itself? Does something have to be turned on over there for card entry to publish?
The page also shows a field for "coupon." I have that set to "no" in the checkout module. Then why is it showing? How do I make it go away? This customer doesn't offer coupons.
Sorry to be asking all these questions. But we are getting and closer and closer!
-Jim Gribble

Thank you. I did figure out some of this myself.
I never did create a warehouse because there is none. Never did link any product to anyu warehouse, that I recall. We only have a few products. Can not I just make sure that the "warehouse" field is empty?
Setting all dimensional values to 1 seems to have solved that problem. Only weight matters, not size.
Did see how to remove coupon in workflow.
Regarding finish, figured there was a CSS trick.
Can change that to "Finish and Pay."
We still don't have a working shipping method because customer has not come up with my needed credentials for the UPS API. I have it turned it on but it's not working properly due to not having all the keys. Can that stop the sytem from clicking through to card entry? For me I know it's not a cache issue because I cleared all cookies. Anything else that could be going on? It is very troubling to not even be able to get to card entry.
I appreciate your detailed responses.
-Jim G.

I'm attaching screenshot of across-the-board "warehouse" configuration for all products. I think it is the system default. You will it says "none." Is this the right way? Should the field be leftt blank?
Thank you.
-Jim G

Thanks for this detailed response. I suspect it's an issue with shipping method. We are really strugglilng with that. Here';s why.
The Hikashop UPS plugin insists on an API access key.
UPS phased them out.
"UPS has implemented an OAuth 2.0 security model for all APIs to enhance the overall security for our customers, reduce fraud and provide enhanced API capabilities. OAuth replaces access keys with a client ID and client secret for authentication. New OAuth credentials must be created on the UPS Developer Portal."

So the plugin appears to be outdated.
Being on top of things, you probably have a plugin update. Where can I get it? It will probably solve this last major issue.
I am attaching screenshot of the plugin screen showing the filed where the access key is required. This installation happened back in April, before UPS made the change.

This is a stunning setback which means a huge amount of work both for the client and for me. The client never did ecommerce before and so never got an access code. There may well be no existing access code which we can use. They will have no idea whatsoever how to set rates manually. Me neither. We were going live in the next few days. When do you think to have a fix? I mean, this impacts a lot of Hikashop subscribers. It's going to reflect very poorly indeed on us. We can't afford to lose clients' confidence. I guess I will try to find if they do have an access key.. Right now it does not appear so. This client, like so many, only recently stopped fighting against the digital revolution, because they got bought by new owners who have a much more open mind. Many things which are considered standard were simply not done. No preexisting digital infrastructure exists. and when we use terms like "access keys," they have no clue..
-Jim Gribble

I just dread having to explain this to my client White Water Marine. Are we totally screwed? Nothing can be done?

I am glad you're working on it. We do have all credentials except access key. I am now an authorized user of customer's UPS account, so I now I can talk to them directly to see if something can be worked out in the interim .
-Jim G.

Hi,
Right now I don't have an access key. I am trying to get one generated so we can launch our new site. If I do get one, I am happy to share that to help you out with testing. I have the content for all the other data fields to complete the connection. Can share those with you also. Will be working on this problem again today and tonight. I am sure all your customers appreciate your attention to this issue.
-Jim G.

How can I get these to you securely? Glad to share.
-Jim Gribble