In the API documentation at https://developers.digitalocean.com/documentation/v2/#create-a-new-droplet it says:
size String The unique slug identifier for the size that you wish to select for this Droplet.
Looking at https://www.digitalocean.com/pricing/#Compute I can see several different sizes in three families “Standard”, “General Purpose”, “CPU Optimized” but no way of translating the size into a slug string for the API.
Looking at the examples I can guess that “Standard” droplets have slug strings
s-<nCPUs>vcpu-<RAMsize>gb but what are the slug strings for “General Purpose” or “CPU Optimized” droplets?
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