In Nigeria, if you want to sell an Amazon gift card worth $30, there are several steps you can follow.

First, you need to find potential buyers. This could be through various online platforms where people are looking for gift cards to purchase. Social media groups related to shopping, trading, or gift cards can be a good place to start. Post about your intention to sell the Amazon gift card, clearly stating its value and any relevant details.

Once you've found interested buyers, make sure to conduct the transaction in a secure way. It's advisable to use a method that offers some level of protection for both parties. For example, you could use an escrow service if available. This ensures that the payment is held securely until you confirm that the gift card details have been successfully transferred and are valid.

Finally, after the transaction is complete, follow up to ensure that the buyer is satisfied and there are no issues with the gift card. Building a good reputation in the process will help you in future sales.