How to add payment method to a customer

You can use the add_payment_method method on a customer object to add a payment method token to a customer on Stripe, this will allow you to charge the customer later on that payment method since it will be added as the default payment method.

from djstripe.models import Customer

customer = Customer.objects.first() # Get the first customer in the database as an example
customer.add_payment_method("pm_card_visa") # Add a payment method to the customer as the default payment method

If you want to add a payment method to a customer without making it the default payment method, you can use the add_payment_method and pass the parameter set_default=False:

from djstripe.models import Customer

customer = Customer.objects.first() # Get the first customer in the database as an example
customer.add_payment_method("pm_card_visa", set_default=False) # Add a payment method to the customer without making it the default payment method

IMPORTANT: For security reasons, Stripe does not let you send raw credit card numbers through their API. You collect card details in the browser with Stripe.js / Elements, which returns a payment method identifier (e.g. pm_...) that you then pass to add_payment_method. See Stripe's payment methods documentation.