You can earn Birchbox's affiliate commissions by promoting their subscription boxes. You should sign up for their affiliate program. You will get a unique link to share with your audience. You can share the link on your blog or social media. You can earn commissions when someone subscribes through your link. You will earn a percentage of the subscription fee. You must create content that attracts potential customers to Birchbox. You can also offer special promotions or discounts to boost conversions. You should track your performance to see which strategies work best for earning commissions.