Payments onboarding usually means a wiki of stale links and a month of overheard acronyms. Replace the reading half of it: send one link, and the guide's chapter order does the sequencing.
The chapters are already in teaching order: every idea lands before the idea that needs it. So the onboarding plan is simply the reading order. A new hire reads under an hour a day for five days, takes the short quiz at the end of each chapter (nobody sees the score), and keeps the tools open once they're on the desk.
Free. No accounts, no seats, nothing to install. Progress lives in each reader's own browser and goes nowhere else.
Reading times are measured, not guessed — they match the header of every chapter. Tick the boxes on paper or in your head; the site also remembers finished chapters per browser.
Written to be sent as-is on someone's first morning. Edit freely; the link is the part that matters.