BVS aimed to reduce call center inquiries, shorten invoice payment times, increase the share of digital payments, and decrease the number of reminders sent. We started with user research, including listening to call center recordings and conducting guerrilla testing, which revealed key issues with the invoices. We then held an analytical workshop and a design sprint to create and test prototypes of redesigned invoices. The result was a 21.6% drop in invoice-related inquiries, an increase in digital payments, and fewer reminders sent. The project was delivered on time and received positive feedback.