Initiate onramp

curl --request POST \
  --url https://api.privy.io/v1/users/{user_id}/fiat/onramp \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --header 'privy-app-id: <privy-app-id>' \
  --data '{
  "amount": "100.00",
  "provider": "bridge-sandbox",
  "source": {
    "currency": "usd",
    "payment_rail": "ach_push"
  },
  "destination": {
    "currency": "usdc",
    "chain": "base",
    "to_address": "0x38Bc05d7b69F63D05337829fA5Dc4896F179B5fA"
  }
}'

{
  "id": "3a61a69a-1f20-4113-85f5-997078166729",
  "status": "awaiting_funds",
  "deposit_instructions": {
    "payment_rail": "ach_push",
    "currency": "usd",
    "amount": "100.0",
    "deposit_message": "BRGFU2Z9TJPJXCS7ZZK2",
    "bank_account_number": "11223344556677",
    "bank_routing_number": "123456789",
    "bank_beneficiary_name": "Bridge Ventures Inc",
    "bank_beneficiary_address": "1234 Elm St, Springfield, IL 12345",
    "bank_name": "Bank of Nowhere",
    "bank_address": "1800 North Pole St., Orlando, FL 32801"
  }
}