Proactively Submit the Published Links and Paperwork (So You Get Paid Quickly!)
One thing you should realize is that your brand contact is often overwhelmed and frustrated when dealing with unprofessional partners.
So, when a sponsorship is completed, make finalizing the campaign with you a breeze.
Send them links to all your published assets.
Send them the vendor paperwork they asked you to complete.
Send them your tax paperwork.
Send them your invoice with the Purchase Order (PO) number and payment terms correctly indicated.

When I ran the agency, about 50% of the time we had to chase people down for missing documents, preventing us from closing the deal.
I'll never forget one creator we chased for three months because she was too busy to send us her invoice.
I guess she didn't need or want the thousands of dollars we were trying to send her (we finally paid her after four months…gee-whiz)!
Please, don't be that person.

Get the ongoing support you need to set win-win pricing, submit spellbinding proposals, and negotiate like a pro.