You you must consult the suppliers policies to be sure of when you’re entitled to receiving a refund.
In general it is important to understand that B2B policies and B2C policies are completely different and have different scopes as they address different needs and entities. This means that what is considered to be valid between you and your customer isn’t necessarily valid between you and your supplier and vice versa.
For example: in order for you to obtain a refund from your uDroppy supplier it could be requested a timely reporting of any malfunctions or anomalies about product integrity, this means for example that if you request a refund for an order that was deliver it 2 weeks ago, the supplier might not grant it.
However, this doesn’t mean that you will have apply the same exact policies as your supplier, you can decide in your policies, for example, that for a matter of trust in your brand, you will grant a refund for problems reported also 40 days after delivery. Such a move can also have marketing purposes and can help gain trust in your brand.
In a nutshell, you don’t have to copy/paste your supplier’s policies to your store, but you must be aware of what he covers in order for you to build the most appealing and functional policies for you and your customers.