Send agreement request to customer
{- "customerName": "string",
- "customerAccIdentifier": {- "Alias": {- "aliasType": "Phone",
- "value": "string"
 }
 },
- "terms": {- "AgreementRequestTermsOneOff": {- "amount": {- "amount": 0,
- "currency": "AUD"
 }
 }
 },
- "purpose": "Mortgage"
}{- "token": "string"
}