Stripe is not configured — add STRIPE_SECRET_KEY or save the Stripe secret key in Admin → Payment Settings
Balance top-up Stripe helper refused to start because the secret key is not configured (shorter Admin → Payment Settings path).
Why this happens
Same root as short Stripe is not configured, shown on top-up flows with this admin path wording.
Diagnose and fix
1. Open Admin → Payment Settings; paste the Stripe secret key; save.
2. Or set STRIPE_SECRET_KEY in the environment.
3. Enable Stripe checkout; retry Account balance top-up.
4. Distinct from the longer Settings → Payment Settings sibling and Phase 42’s “env or Admin…” variant.