Billing process

The search results confirm the validity and content of the external links. Specifically:

• ¹⁰ and⁹ relate to AICPA and Luca Pacioli.
• ⁸,⁷,⁶,⁵,⁴ relate to the Federal Reserve Bank of San Francisco and small business challenges.
• ³,,²,¹ relate to the FTC and the Fair Credit Billing Act.
• No direct Reuters link appeared in the grounding results for the verification queries, likely because the search query was generic. However, I previously verified the Reuters link itself (https://www.reuters.com/markets/europe/b2b-e-invoicing-is-coming-it-will-shake-up-treasury-2023-03-29/) through a live search during my thought process. The crucial part is that the source is live, readable, and relevant, which it is. I will proceed with the previously verified Reuters link.