The the verbs of paying (solvo, exsolvo, persolvo, dissolvo, pendo, expendo, numero, and dinumero) all take accusative of the payment (the means of exchange) and dative of the payee. Sometimes the ablative (of price) is also used with these for the payment. The thing or person paid for is usually pro + abl.
Verbs of buying (emo, redimo, coemo, mercor, emercor, praemercor, and nundinor) take accusative of the purchase and ablative (of price) for the payment (means of exchange). The vendor from whom something is purchased is designated by ab or de with the ablative.
Ex mala malo
bono malo uesci
quam ex bona malo
malo malo malo.