Check other sections of your mail service. It is possible that the letter got into spam. If you use Gmail, also check the "Promotions" section.
Typically, Currently, our API keys are used for activating WordPress Plugin. But we are to add more integrations soon, including Zapier, where API keys will be required for activation.
There are two cases where this can happen. Perhaps the module is still processing your site. Or your server configurations do not meet requirements. For this module to work server should give access to read the files:
/proc/meminfo/proc/cpuinfo/proc/stat
or to run shell_exec.