I am trying to send SMS via e-Commerce application Opencart but SMSs are not getting delivered

I have installed Opencart e-Commerce application on DigitalOcean but the SMSs are not getting delivered. The same application is able to send SMS from another server bigrock. I checked the log of the service provider. The transaction from Digital Ocean hosted application was not listed. The SMS Service provider is Obligr


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How does your app connect to Obligr? Is it possible that Obligr whitelists IP address that can connect to it?