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I am checking this already. I will get back to you shortly.
Please test my demo form https://form.jotform.com/53596299756982. Submit the form in actual and it will properly proceed to Paypal.
It work like this
as you can see on the video above, the form cannot be submitted if the Donation value is blank or is 0.00 only.
I have added a separate Donation Textbox on the form and then create Conditions like this
I have also hidden the Paypal Donation Textbox using CSS codes so that it cannot be modified by the end-user.
visibility : hidden;
You can clone the demo form https://form.jotform.com/53596299756982 so that you can use it as your own. Just update it on your Form Builder as needed.
Let us know if you need further assistance.
Why does the bottom "donation via PayPal" box show $25.00, grayed out? It should be blank until the user chooses from the drop-down list. Also, they should not be able to delete the amount once it appears in the bottom box. If you delete it now, it goes back to $25 grayed out, even though the dropdown list might still say $100.
The problem is that people have been choosing from the drop-down list and then deleting the amount that appears in the bottom box because they think they'll have to use PayPal rather than a credit card. Can we get rid of the "Payment method" window altogether and have the bottom box read "Donation via PayPal or credit card"? Once they click on "Proceed to Checkout," they'll have the option to us a credit card.
The "Donation (USD)" field shows the amount grayed out because the amount "$25.00" is set "Hint Example" of the text box. Its just a sample text and not actual value of the textbox. Please check the screenshot below:
Please take a look at the following cloned form where I have made the changes and see if this works as expected: https://form.jotform.com/53610722832955
I have removed the "Payment method" dropdown field. You can also make the "Donation (USD)" field read only so that user cannot edit the amount.
Feel free to clone this form for a closer look. The following guide should help you in form cloning: http://www.jotform.com/help/42-How-to-Clone-an-Existing-Form-from-a-URL
Hope this helps.
Do get back to us if you need any other changes.