Examples of the cf_stripe_pre_payment filter to use stripe token generated by Caldera Forms for alternative API calls. See: https://calderaforms.com/doc/cf_stripe_pre_payment/

cf_stripe_pre_payment.php

<?php
/**
 * Use Caldera Forms Stripe Token with Stripe API
 *
 * In this example a customer is created and then an authorization, not a charge is created.
 */
add_filter( 'cf_stripe_pre_payment',function( $early_return, $token, $config, $form ){

	//change your field IDs here!
	$email = Caldera_Forms::get_field_data( 'fld1234567', $form );
	$name  = Caldera_Forms::get_field_data( 'fld1234568', $form );

	$customer = \Stripe\Customer::create(array(
		"description" => $name,
		"email" => $email,
		"source" => $token
	));


	\Stripe\Charge::create(array(
		"amount" => 2000, //amount is in cents, this $20
		"currency" => "usd",
		"source" => $customer->id,
		"capture" => false,//authorize, but not charge
		"description" => "Authorization for $name $email"
	));


	//returning true prevents Caldera Forms default behaviour
	//IMPORTANT: you can not use tokens twice, so if you returned null here, Caldera Forms would attempt to use same token, and fail
	return true;

	//You may also return an error array here
	return array(
		'type' => 'error',
		'note' => 'Charge could not be completed'
	);

}, 10, 4 );

cf_stripe_pre_payment2.php

/**
 * Use Caldera Forms Stripe Token with Stripe API
 *
 * In this example a customer is created (so customer can be reused) and then customer is charged 1 time, according to processor settings
 */
add_filter( 'cf_stripe_pre_payment',function( $early_return, $token, $config, $form ){
	//Create customer
	try {
		$customer = \Stripe\Customer::create(array(
			"email" => Caldera_Forms::get_field_data($config['email'], $form),
			"source" => $token
		));
	} catch (Exception $e ) {
		//Stop processing and use Exception message as error.
		return array(
			'type' => 'error',
			'note' => $e->getMessage()
		);
	}
	
	try {
		$charge = \Stripe\Charge::create(array(
			"customer" => $customer,
			"amount" => (Caldera_Forms::get_field_data($config['amount'], $form) * 100), // amount in cents, again
			"currency" => strtolower($config['currency']),
			"description" => $config['description'],
		));
	} catch (Exception $e) {
		//Stop processing and use Exception message as error.
		return array(
			'type' => 'error',
			'note' => $e->getMessage()
		);
	}
	return true;
}, 10, 4 );