You can communicate with any SAP system from PHP in many ways, but the preferred standard options are:
PHP has an RFC library for communicating with SAP. But in your problem statement the main job lies with your partners as they are the ones who deal with the SAP components. You need to check with them whether they prefer services or RFCs. Please don't forget to double check with them in case they already have any existing API (can be anything) that meets your needs. Because it's entirely up to them how they want you to access their data.
Additionally, the data can be fetched multiple times based on demand, it all depends on when the data is updated and refreshed. You can configure the call (whether it's an RFC or a service) with some scheduled task to run only once a day
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