Affirm, headquartered in San Francisco, offers their dynamic payment system for ecommerce, supporting payments broken out into installments to accommodate shopper preference.
We use Affirm with a Woocommerce/Wordpress website and there is a plugin that integrates Affirm for us. We also use a payment method plugin that limits Affirms availability only to products that they support. Generally, we have had a good experience with integration and payments from Affirm to us are consistent and timely. People finance guitars, pedals, and amplifiers and it offers us a way to reach a customer base that may not otherwise purchase from us.
Easy to use, simple to integrate, especially if you are using Shopify Plus. Putting everything live and active was easy. We did have to do some simple HTML/CSS to make everything look the way that we wanted it to, but that was very easy and something that we did in house. If you can do some simple style work, you won't have any issues at all.
Shop Pay uses affirm but it's more integrated with Shopify. I recommend Shop Pay more if you are interested in using pay as you go. There's better integration at the checkout and they treat customers really well. I highly recommend moving over to Shop Pay if you already use Affirm.
Well, since it cost us nothing to implement, and we did the customization to the look and felt in-house, we saw an immediate positive ROI. Orders starting happening within the first week of implementation and haven't stopped since. We don't get tons of orders from Affirm, but it is steady, and they are typically for several thousand dollars.