# Integration Parameter

If you are integrating Payrexx using the [iFrame ](https://docs.payrexx.com/developer/guides/embedding/iframe)or [modal window](https://docs.payrexx.com/developer/guides/embedding/modal-window) integration, this parameter can be used

| Fieldname  | Parameter         |
| ---------- | ----------------- |
| Purpose    | invoice\_number   |
| Amount     | invoice\_amount   |
| Currency   | invoice\_currency |
| Salutation | contact\_title    |
| First name | contact\_forename |
| Surname    | contact\_surname  |
| Company    | contact\_company  |
| Street     | contact\_street   |
| Postcode   | contact\_postcode |
| Place      | contact\_place    |
| Country    | contact\_country  |
| Telephone  | contact\_phone    |
| Email      | contact\_email    |