Will my promo code apply to each charge with my monthly payment plan? When purchasing a monthly payment plan our promo codes will only apply to the first order. Related articles What’s your refund, cancellation, and return policy? How do I contact Customer Service? What do I do if my promo code isn't working? How do I cancel my 6 Month or 12 Month Payment Plan? Will Stage 1 introduce each allergen one at a time?