How can I let the customer to be able to type the payment amount they owe in a form?

Hi I run a veternerian office and I need the customer to be able to type the payment amount they owe in a form. What template can I use? 

Hello,

You can check out any of the payment form templates here: https://www.jotform.com/form-templates/category/payment 

OR you can create a custom form at your end. Then add a payment field and set up the payment type as "User defined amount" on the payment settings:

Here is an example using PayPal Personal payment field:

This will let the user enter an amount manually and then make the payment. You can mark this field as required, if necessary.

Here is a related guide on how to mark a field as required: https://www.jotform.com/help/546-How-to-Set-a-Field-as-Required-or-Non-Required 

Do review and let us know if you have any further questions.

Is this user-defined amount field available for PayPal Business and PayPal Invoicing

Is this user-defined amount field available for PayPal Business and PayPal Invoicing

Yes, the User Define Amount is available for PayPal Business and PayPal Invoicing.

Please try it and let us know if you need further assistance. Thank you.