Support Simple Send Transaction on the backend.
Add the currency id on the service.
Use TransactionGenerationController on the Send Page
Make transaction_from always required
Added transaction_from parameter.
Generalize error and success messages
Remove old API endpoint
Add two HEXSPACE vars, as well as transactioN_to field
Send pubkey as requiered field from the frontend
Added transaction_to as required field to the frontend
Add pubkey from client
Fix the send amount to convert the value to satoshis accordingly