Hey there Mlazcano,
If you are receiving a declined payment message, you can follow the guidelines on how to resolve it with the steps from If your payment method is declined in the App Store or iTunes Store - Apple Support, seen below:
How to complete your purchase if a payment failed or was declined
1. On your iPhone or iPad, open the Settings app.
2. Tap your name.
3. Tap Payment & Shipping.
4. Add a different payment method and remove the old one.
5. Try to complete your purchase.
If you still can't make a purchase
• You might have an unpaid order. Learn how to pay an unpaid order.
• Contact your financial institution.
• You might need to ask your financial institution to allow international purchases on your debit or credit card.
• If you want to know why a debit card, credit card, or other payment method was declined, speak with your financial institution. Apple doesn't have information about why the payment method was declined.
• In some countries and regions, your payment method might be declined because of changes to local law. Learn about billing and purchases in Europe or what to do if your card is declined in India.
Should you still need help after that, we encourage you to get in touch with Apple Support directly. They'll have the tools and resources to further assist. You can reach them here: Get Support
Thanks for visiting the Apple Support Communities!
Cheers.