In Odoo, SMS messages can be sent to customers, job applicants, and others. Odoo offers an IAP service where users can purchase credits and use them for sending SMS messages. More details can be found here: https://iap-services.odoo.com/iap/sms/pricing
However, there was a growing need to send SMS messages using a custom SMS server instead of Odoo's built-in system. There were several ways to achieve this, but since we wanted a solution that would also work in Odoo Online, we aimed to implement it without developing a custom Odoo module. (In fact, we previously created a similar handler together with a partner, so if such a solution is needed, we can provide it.)
Instead, we set up the workflow using n8n, where messages are forwarded in batches of 50 to avoid overloading the SMS server. One important aspect was ensuring that already sent SMS messages are not resent by the system.
