Generating a subscription offer signature using golang. see https://developer.apple.com/documentation/storekit/in-app_purchase/generating_a_subscription_offer_signature_using_node_js
tptpp/subscription-offer-signature
Generating a subscription offer signature using golang. see https://developer.apple.com/documentation/storekit/in-app_purchase/generating_a_subscription_offer_signature_using_node_js
GoMIT