Problem:

If I only have a debit card, how do I pay for the subscription?

Solution: 

At the moment, DataCamp only accepts payment via credit card or PayPal for individual users.

However, certain Visa and Mastercard debit cards are still accepted because they rely on their credit card network to process online, phone, and international transactions. Debit cards alone cannot support the online purchase, which generates a declined transaction.

The debit card's compatibility will depend on the bank's networks, so you might need to contact your bank to understand why your Visa debit card is declined. 

See also: 

• ZIP / Postal Code for DataCamp Payment Method
• Why did PayPal charge me for a DataCamp plan that I cannot access?
• Can I purchase a DataCamp subscription in my native currency?