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ChangeTierDto

tierIdstringrequired

The new pricing tier id. Must belong to the same agent as the subscription. The billing semantics are derived from the price comparison vs the current tier: upgrades (new price > current) bill the proration immediately and only grant access after payment lands. Downgrades (new price ≤ current) keep current-tier access until the end of the billing cycle, then flip at the next renewal.

ChangeTierDto
{
  "tierId": "string"
}