To get started, you will need to create a public token from your server. You will then pass this token to your frontend to initialize the SDK.

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Payment Sessions

Create a Payment Session Token when you want to accept money now. You can pass a bankAccountId to this mutation which determines which of the Firm’s Bank Accounts the money will be directed to. If you do not pass a bankAccountId the Firm’s default operating account will be used. 
mutation PaymentSessionCreate($input: PaymentSessionCreateInput) {
    paymentSessionCreate(input: $input) {
        paymentSessionToken
    }
}

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Save Payment Method Session

Create a Save Payment Method Session Token when you want to save the payment details now, then use them to make a payment at a later date. You can optionally pass in a clientId if you know which Client this Payment Method should be saved under. 
mutation StartSavePaymentMethodSession($input: CreateSavePaymentMethodTokenInput) {
    createSavePaymentMethodToken(input: $input) {
        savePaymentMethodToken
    }
}
You’ll need to add the Firm API Token as the x-api-key header for the request. x-api-key=f_secret_env_******
Return the paymentToken to your frontend to initialize the sdk.