Errors

{
  "error": {
    "type": "invalid_request_error",
    "code": "currency_country_mismatch",
    "message": "UG settles in UGX, but this charge is in KES.",
    "param": "currency",
    "doc_url": "https://docs.skanpay.website/errors/currency_country_mismatch",
    "request_id": "req_01J9Z3K8Q4W6XK2M7N5P0R3T8V"
  }
}

const res = await fetch(url, options);
const body = await res.json();

if (!res.ok) {
  const { code, message, param, request_id } = body.error;
  switch (code) {
    case "network_required":
      return askCustomerForNetwork();          // then retry with network: "MTN" | "AIRTEL"
    case "invalid_msisdn":
      return showError("Please check the phone number.");
    case "amount_below_minimum":
    case "amount_exceeds_transaction_limit":
      return showError("This amount can't be paid by mobile money.");
    case "idempotency_key_in_progress":
    case "rate_limit_exceeded":
    case "internal_error":
    case "database_unavailable":
    case "no_route_available":
      return retryLaterWithSameKey();
    default:
      console.error("SkanPay error", code, message, param, request_id);
      return showError("Payment could not be started. Please try again.");
  }
}