Turns out programmatically buying gift cards is not an easy thing to gain access to. Wish bitrefill would offer an API to purchase gift cards. 

Every gift card provider I've found requires a business account, and needs to "review" your application before giving you access. 

So much for my ecash -> gift card app idea... 

 Makes you think twice about buying a gift card from bitrefill...

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 Maybe use something like https://axiom.ai/ ?