You can only enter an amount between $1.00–$5,000 when setting up a multi-use payment link, userjlondon.
Creating a payment link exceeding $5,000 is currently unobtainable. Since you wish to be able to specify a greater amount, I recommend submitting a suggestion to our developers. They will review and consider it for future enhancements based on the number of users' requests.
To proceed, follow these steps:
Go to the Gear icon.
Under the Profile column, select Feedback.
Share your suggestion, then click Next.
Furthermore, you can track them and stay updated on recent developments by visiting our website or blog.