Many online payment networks now allow instant installment plans for small retail purchases. Normally, the purchase would be a one time payment. These products transparently convert it to a payment plan, often without interest.
For example, PayPal has a service where instead of say, paying $60 for a pair of shoes, you can pay 4 installments of $15. This is implemented as a loan, so they ask for SSN, your credit history etc.
Does routinely using such services negatively impact your credit score?