How do I allow my freelancers to send me a payment request?

For freelancers to be able to send you payment requests, you must first book them.
 
Under “Workforce” you can access your freelancers and book your freelancer from there. By doing so, you allow this freelancer to send you payment requests.
You can give the booking a title and determine the payment method (hourly basis vs. deliverable). If necessary, enter the agreed hourly rate and determine whether the freelancer may adjust this for future payment requests.
 
Freelancers that you have booked via a tender can automatically send you payment requests for the respective booking.