Payment portal

I need a payment provider with the lowest fees possible that allows me to provide acceptance for eth. It would be better if the service or script holds the eth instead selling them in order to preserve the value for the moment.

Also it would be needed to have a connection of user who invested to the invested amount. For example a website implements a widget for the script or service I provide. They want to get a callback when the user invested and when it happened they will receive the txid.

Also I would need to know exactly from which to which address the eth has been sent. So that the coin trail is intact.

Do you have suggestions for me?

Thanks in advance!
Sebastian
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