Hello SIr,
I'm Mahmoud Hegazy Full Stack Web Developer, I have extensive experience in Python, relational databases, and Building API I can create API in Flask or PHP that handle this task every data received store into your Database , I will use MySQL, and Gmail API , Hosting the API you have 2 options, AWS, and digital ocean it cost 5$ for 1 LightSail per month , that all we need to host a working API I can host it in few minutes I will take €100 and finish in 5 days maximum pay and award after task done , AWS and digital ocean offer free credits for 1 year
thank you.