Merge pull request 'default currency resolver' (#78) from currency-76 into main

Reviewed-on: #78

api/server/interface/api/srequest/payment_intent.go

@@ -15,6 +15,12 @@ type PaymentIntent struct {
 	Attributes     map[string]string `json:"attributes,omitempty"`
 }
 
+type AssetResolverStub struct{}
+
+func (a *AssetResolverStub) IsSupported(_ string) bool {
+	return true
+}
+
 func (p *PaymentIntent) Validate() error {
 	// Kind must be set (non-zero)
 	var zeroKind PaymentKind
@@ -34,7 +40,7 @@ func (p *PaymentIntent) Validate() error {
 		return merrors.InvalidArgument("amount is required", "intent.amount")
 	}
 	//TODO: collect supported currencies and validate against them
-	if err := ValidateMoney(p.Amount, nil); err != nil {
+	if err := ValidateMoney(p.Amount, &AssetResolverStub{}); err != nil {
 		return err
 	}