async createProductForTier(tier) {
        const product = await this.stripeAPIService.createProduct({name: tier.name});
        await this.StripeProductModel.add({
            product_id: tier.id.toHexString(),
            stripe_product_id: product.id
        });
        return product;
    }
@param {import('../../../tiers/Tier')} tier
@returns {Promise<import('stripe').default.Product>}