Use a donor-centered decision process
Start with evidence the nonprofit already owns: donation-form analytics, device mix, abandoned attempts, donor questions, event behavior, and the share of one-time versus recurring gifts. Ask which supporters are being excluded by the current process and whether a new method solves that specific problem.
Next, map every proposed option from donor selection through confirmation, reporting, refunds, and support. A payment method is not useful merely because it can appear as a button. Staff should know how to recognize its status, find it in reports, answer a donor's question, and correct a mistaken campaign designation using supported administrative tools.
Finally, introduce one meaningful change at a time. Track completed donations, unsuccessful attempts, donor support requests, mobile completion, reconciliation effort, and method use. Do not assume that a short-term increase proves causation or that adding every available method will improve the experience.