My team has plenty of experience integrating payment solutions to any type of website. This can be added to e-Commerce sites, Landing Pages, Newsletter Pages. Among the possible services that need a checkout: - Subscription Checkout - Product Checkout, and possibly add a Cart for checkout in e-Commerce. - Tips payouts: e.g. buy me a coffee!. We have worked with several people to add Payment Gateway, especially Stripe. Stripe is a good option because it does not require too much knowledge from the clients. So our difference by helping with Stripe is an up-front investment to set up the checkout. For maintenance, we can create a mechanism to upgrade your Stride products, however, the simplest checkout would be the fastest to develop.