The Sendcloud REST API gives you access to 170+ couriers, including GLS, through one credential set, one schema, one webhook stream, and one error model. Connecting couriers individually means handling separate authentication, payload formats, and tracking systems for each, and redoing the work every time a courier ships breaking changes upstream.

With Sendcloud, you ship GLS alongside DHL, UPS, PostNL, and DPD, or any other courier in your account using the same code. Route shipments between couriers based on rules (weight, destination, service level, cost) without writing courier-specific routing logic. Fall back to alternative couriers automatically if GLS's upstream system has issues.

Adding a new courier later means adding it to your Sendcloud account, not building a new integration.