Where must promotional trade-in credits be applied?

Promotional trade-in credits must be applied to in-store purchases because this approach allows for immediate verification of the trade-in device's condition and eligibility. Applying the credit in-person facilitates a seamless transaction, as customers can directly interact with store personnel during the process. This reduces the likelihood of misunderstandings regarding the condition of the device being traded in, which would be more challenging to manage through online methods or processes like email requests. Additionally, handling trade-ins in-store improves customer satisfaction by enabling immediate adjustments to pricing or account credits, enhancing the overall shopping experience.