Using marketplace nodes
You can use the nodes in the marketplace while designing your services. However, if the node you are looking for is not available in the marketplace, you can create a new custom RESTFul API node and submit it to the marketplace.
To add a marketplace node to your service via Designer, you need to Navigate to Services view and select the service you would like to modify. In the service details view, from the left Nodes Library panel, select Marketplace. Find the marketplace node you are looking for and drag & drop it into your service flow. You can customize your new marketplace node similar to other core nodes from the Node Properties panel on the right.