Glyph mini to Gliph

I bought Glyph mini less then a month. Now I understand that I should move to full version: Glyph.
Should I pay full payment for Glyph or just difference? As I do not need both of them.

Many thanks,

AFAIK there is a discount for moving from Glyphs mini to Glyphs. Please contact (office) at (this website without www) for a coupon code.