function createSpaResponseShapes() {
  function findNestedObject(value, predicate, visited = new Set()) {
    if (!value || typeof value !== "object" || visited.has(value)) {
      return null;
    }

    visited.add(value);

    if (!Array.isArray(value) && predicate(value)) {
      return value;
    }

    for (const child of Object.values(value)) {
      const match = findNestedObject(child, predicate, visited);

      if (match) {
        return match;
      }
    }

    return null;
  }

  function findAccountPlanId(response) {
    const account = findNestedObject(response, (value) => (
      Object.prototype.hasOwnProperty.call(value, "id")
      && value.id !== null
      && value.id !== undefined
      && value.id !== ""
    ));
    return account ? account.id : "";
  }

  function extractAccountPlans(response) {
    const plans = [];
    const visited = new Set();

    const visit = (value) => {
      if (!value || typeof value !== "object" || visited.has(value)) {
        return;
      }

      visited.add(value);

      if (!Array.isArray(value) && (
        Object.prototype.hasOwnProperty.call(value, "planType")
        || Object.prototype.hasOwnProperty.call(value, "subPlanNum")
      )) {
        plans.push(value);
        return;
      }

      Object.values(value).forEach(visit);
    };

    visit(response);
    return plans;
  }

  return { findNestedObject, findAccountPlanId, extractAccountPlans };
}