i have an ipad and an iphone with different apple ID on each, can I use a single icloud subscription
Can I use both devices on a single iCloud storage subscription
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The subscription is tied to the Apple ID, so if each device using a different Apple ID, the only way to share the iCloud subscription would be to either make them use the same Apple ID, or use Family Sharing to share the subscription across different Apple IDs.
Note that to share the iCloud subscription across different Apple IDs with Family sharing it must be a 200GB or 2TB plan. The 50GB plan cannot be shared.
See here: link-> Share an iCloud storage plan with your family - Apple Support