…854] (#2488)

# Motivation

We create an util to generate the source link to provide to the Onramper
widget, given a set of parameters. Documentation can be found
[here](https://docs.onramper.com/docs/supported-widget-parameters).

For now we define a small set of FIAT currencies, just for the scope of
testing. The list can be expanded or improved after.

# Changes

- Create ENV variables for Onramper API keys.
- Add types for params of the new util.
- Create utils to build the source code and concatenate all params into
a single string.
- Create tests.

# Tests

Create some tests to verify the correct widget link: the links were
manually tested in the [Onramper
sandbox](https://docs.onramper.com/docs/customise-the-ux) and simply
opening them in the browser with the test API key.

…4] (#2510)

# Motivation

We would prefer to have a clear indication that Onramper is in DEV mode
when an user clicks on the Buy button: we adapt the modal title based on
the ENV.

# Motivation

We include the Onramper widget among our components and in the buy
modal.

# Changes

- Create util to transform a `wallet` object into an acceptable wallet
input for Onramper (and test).
- Create OnramperWidget component:
- Default crypto is (in mutually excluding order):
  - the token in which transaction page the user is
- the native token of the selected network, if any (e.g. IC selected is
ICP, Ethereum selected is ETH)
  - ICP token
- The only cryptos enabled are the ones that have a correspondent
Onramper ID coded (same goes for networks)

# Tests

### Desktop


https://github.com/user-attachments/assets/92b10d4b-0a04-473d-8ac2-d8f82f2bab69

### Mobile


https://github.com/user-attachments/assets/e9df38d0-0603-4f79-8fa2-76cf7dce1b1b