The newest dynamic rule introduced in the 2.2.0 update allows you to make available particular payment methods / gateways only when certain value thresholds are met.
The configuration is simple: select who the rule applies to, the payment method, and the minimum value.
The rule applies to cart totals, and even includes shipping costs. For example, switching between a flat rate shipping method costing $9, say postage, and a more expensive method, UPS, costing $25, the difference between the two can be enough to make a payment method available.
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