RPC (Remote Procedure Call) providers allow your website or application to communicate and send requests such as transactions to the blockchain.
When running a website or app that uses Solana Pay or similar, RPC requests are used to request data from the Solana node cluster. Then, specially designed RPC nodes (sometimes called RPC endpoints) process RPC requests made by a your website/app, run transactions through the network’s validator protocol, and send back any data the website/app has asked for.
Default for SolPress Payment Plugin is https://solana-mainnet.rpc.extrnode.com.
Alternatives you can use include:
- https://solana-mainnet.rpc.extrnode.com
- https://rpc.ankr.com/solana
- https://try-rpc.mainnet.solana.blockdaemon.tech
- https://getblock.io/nodes/sol/
- Other alternatives and explanations about RPCs can be found here – https://www.alchemy.com/overviews/solana-rpc