Add Printful and Printify API to Shopping (#358)

README.md

@@ -1514,6 +1514,8 @@
 | [Octopart](https://octopart.com/api/v4/reference) | Electronic part data for manufacturing, design, and sourcing | `apiKey` | Yes | Unknown |
 | [OLX Poland](https://developer.olx.pl/api/doc#section/) | Integrate with local sites by posting, managing adverts and communicating with OLX users | `apiKey` | Yes | Unknown |
 | [Platzi Fake Store](https://fakeapi.platzi.com/) | A fake store API for your e-commerce or shopping website prototype. For testing and learning | `apiKey` | Yes | Unknown |
+| [Printful](https://developers.printful.com/) | Printful's official API to manage and integrate their services | `OAuth` | Yes | Unknown |
+| [Printify](https://developers.printify.com/) | Printify's official API to manage and integrate their services | `OAuth` | Yes | Unknown |
 | [Rappi](https://dev-portal.rappi.com/) | Manage orders from Rappi's app | `OAuth`| Yes | Unknown |
 | [Shopee](https://open.shopee.com/documents?version=1) | Shopee's official API for integration of various services from Shopee | `apiKey` | Yes | Unknown |
 | [Tokopedia](https://developer.tokopedia.com/openapi/guide/#/) | Tokopedia's Official API for integration of various services from Tokopedia | `OAuth`| Yes | Unknown |