# redsys-api-js
# How to use
## Create payment form
```javascript
const RedsysAPI = require('redsys-api');
var redsys = new RedsysAPI();
// Add some Parameters
redsys.setParameter('DS_MERCHANT_AMOUNT', 945);
redsys.setParameter('DS_MERCHANT_ORDER', '123456789101');
redsys.setParameter('DS_MERCHANT_MERCHANTCODE', '343801064');
redsys.setParameter('DS_MERCHANT_CURRENCY', '978');
redsys.setParameter('DS_MERCHANT_TRANSACTIONTYPE', data['transactionType']);
redsys.setParameter('DS_MERCHANT_TERMINAL', '1');
redsys.setParameter('DS_MERCHANT_MERCHANTURL', 'http://some_url.com');
redsys.setParameter('DS_MERCHANT_URLOK', 'http://some_other_url.com');
redsys.setParameter('DS_MERCHANT_URLKO', 'http://another_url.com');
redsys.setParameter('DS_MERCHANT_CONSUMERLANGUAGE', '002');
redsys.setParameter('DS_MERCHANT_PRODUCTDESCRIPTION', 'Some description');
var key = 'sq7HjrUOBfKmC576ILgskD5srU870gJ7';
var params = redsys.createMerchantParameters();
var signature = redsys.createMerchantSignature(key);
return `
Test
`;
```
## Verify signature
```javascript
// let data be the data from the notification request. then
const RedsysAPI = require('redsys-api');
var redsys = new RedsysAPI();
var encoded = data['Ds_MerchantParameters'];
var signature = data['Ds_Signature'];
var key = 'sq7HjrUOBfKmC576ILgskD5srU870gJ7';
if (redsys.checkMerchantSignatureNotif(key, encoded, signature)){
var decoded = redsys.decodeMerchantParameters(encoded);
// do something with the decoded data
} else {
// do something else
}
```
Note that there is also a method `redsys.createMerchantSignatureNotif(key, encoded)` available that returns base64 signature
to compare with the original, however due to some base64 differencies it is recommended to use the
`redsys.checkMerchantSignatureNotif(key, encoded, signature)` method. However if you want to use it, make sure to convert
the original signature as `Buffer.from(signature, 'base64').toString('base64');