- Platform cache : I am using platform cache but platform cache is not returning anything after very small period of time ( approx 30 sec- 60 sec ).
- Custom Setting : Custom setting has a limitation of fields can be created max 255 character. Access tokens are more than that.
- Custom Object : Custom Object won't be good solution i think considering it's sensitive data.
- Custom Metadata : I am not sure.
Any Idea what would be the best approach?