There are a few different ways that you can pay with Klarna on Shopify.
If you're using Klarna's Pay later option, you can choose to pay for your purchase 14 days after you receive your order. To do this, you'll need to provide your date of birth and your social security number when you checkout.
If you're using Klarna's Slice it option, you can choose to pay for your purchase over time with monthly payments. To do this, you'll need to provide your credit or debit card information when you checkout.
You can also choose to pay for your purchase using Klarna's Financing option. With this option, you can choose to pay for your purchase over time with monthly payments. To do this, you'll need to provide your credit or debit card information when you checkout.
For more information, you can visit Klarna's website or contact their customer support.