[AlphaCommerceHub] Why does a pay page launched manually from my merchant interface shows «Amount: 0» instead of the amount specified on the «Preview» step?

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I have got an answer from AlphaCommerceHub:

Per the specification the amount format is 14,3 so an amount of 1 as a minor unit would not be displayed e.g. you would need a minimum of 10 equating to 0.01