The key to preparing a campaign is ensuring everyone understands exactly when the offer applies.
Conditions, scope and timing
Write down product groups, customer groups, quantities and cart-value conditions. Clarify start and end times. Define how the discount combines with shipping or other coupons.
Think through edge cases
Describe what happens if a product leaves the cart, quantities decrease or a second campaign applies. Assess how variations and stock limits affect the rule.
Check the presentation
Which price will customers see on product and cart pages? Where will the offer conditions be explained? The software rule and campaign copy should say the same thing.