Cloud adoption and Software-as-a-Service is one of the most significant changes in the IT world today. Businesses are moving to the cloud to take advantage of lower costs, sustainable charging models, workload elasticity and new delivery models among other benefits. New SaaS businesses are springing up all over the cloud delivering services via APIs - standalone functionality meant for the consumption, integration and combination into business workflows. One of the most successful SaaS providers is Xero which provides online accountancy software and services to small and medium businesses. Sixtree is a Xero customer and we utilise their API in our day-to-day business.