Create a gated migration plan when engineering, finance and support have different definitions of success.
Technical program and delivery managers coordinating teams.
Your approach: Use a plan, dependency map, decision table or prose. A service diagram or implementation code is not required.
Own a 12-week migration from one payment processor to another. Produce an executable program plan with evidence-based go/no-go decisions rather than a list of meetings. No detailed service diagram is required if the dependency and decision flow is clear.
Declare the initial implementation and rollout window; an extension must be a separately approved contingency.
Required target: ≤ 12 weeks
No cohort expands until payment, refund and settlement reconciliation is demonstrated with an owner and measurable gate.
Explain which transactions can be rerouted and which must be reconciled on the original processor.
Account for non-transferable tokens and any customer action without assuming token portability.
State measurable customer, financial and operational outcomes, plus explicit non-goals.
Assign accountable roles and sequence token work, integration, finance validation, cohorts and support readiness.
Define evidence, thresholds, decision owners and rollback boundaries for each cohort.
Prioritize risks, give leading indicators and decision deadlines, and compare paying for an extension with accepting residual risk.
Assume reconciliation breaks for 0.4% of a pilot cohort in week eight. Explain containment, escalation and re-planning.