My client failed to approve the requested payment for Direct contract

[#1]

Hi Everybody, 

I have created a Direct contract since a few weeks ago. The project has been successfully completed. I have sent a payment request, but when my client tries to approve it, it shows him the attached message.
Can you help me to approve it?? 

Thanks  

[#2]

Hi Mohammed,

We'll have one of our agents reach out to you via a support ticket to assist you and your client with this concern. 

Thank you for reaching out to us. 

[#3]

Thanks for your reply. I can not find the request button, it seems it is a hidden button