For this to go smoothly, most web services and software companies use an API so that developers can build links and send data to and from the systems.
We at Joomlaproffs have integrated many APIs over the years and we currently have ready-made connections to Visma, Klarna, Unifaun, Swish, BankID and iZettle. We are now building these with two more:
Fortnox - Sweden leader in web-based accounting and invoicing.
Shipping Hunting - Freight Hunting is a full-scale TA system where you smoothly handle your shipping online with booking, shipping labels, tracking and returns.
Read more about our integrations with Joomla CMS here https://www.joomlaproffs.se/integrationer