Systems are not isolated anymore. Integrating an API can place a company or a business in another level for many reasons. APIs are a door onto the world, towards the outside. Towards persons and companies that have talent and can enrich products and services with their experience and their training. An API is an entrance gate of all that talent for a business structure in order to improve it and make it grow. The innovation leading companies usually have one or few APIs. Google, MailChimp, Ingenico, Redsys, SalesForce, A3 Software, Inespay… APIs are a key element in any innovative process. From PaellaSoft, we are experts in integrating external systems: CRM, ERP, API REST, MicroServices, WebServices. All our developments have their base API REST that gives them its flexibility, stability and security.