@vulog/aima-promocode/src/getPromoCode.ts

```bash npm i @vulog/aima-client @vulog/aima-promocode ```

import { Client } from '@vulog/aima-client';
import { z } from 'zod';

import { PromoCode } from './types';

export const getPromoCodeByReference = async (client: Client, reference: string): Promise<PromoCode | undefined> => {
    const result = z.string().trim().min(1).safeParse(reference);
    if (!result.success) {
        throw new TypeError('Invalid reference', {
            cause: result.error.issues,
        });
    }

    return client
        .get<
            PromoCode[]
        >(`boapi/proxy/billing/fleets/${client.clientOptions.fleetId}/promoCodes?reference=${reference}`)
        .then(({ data: [r] }) => r);
};

export const getPromoCodeById = async (client: Client, id: number): Promise<PromoCode | undefined> => {
    const result = z.number().positive().safeParse(id);
    if (!result.success) {
        throw new TypeError('Invalid id', {
            cause: result.error.issues,
        });
    }

    return client
        .get<PromoCode>(`boapi/proxy/billing/fleets/${client.clientOptions.fleetId}/promoCodes/${id}`)
        .then(({ data }) => data)
        .catch((error: any) => {
            if (error.formattedError?.status === 404) {
                return undefined;
            }
            throw error;
        });
};