append( Amount::make('amount'), Hidden::make('currency'), Hidden::make('levelId') ); } /** * @since 3.0.0 */ public function enableSubscriptions($enable = true): self { $this->subscriptionsEnabled = $enable; return $this; } /** * @since 3.0.0 */ public function subscriptionDetailsAreFixed($fixed = true): self { $this->subscriptionDetailsAreFixed = $fixed; return $this; } /** * @since 3.0.0 * @throws NameCollisionException */ public function donationType(Field $field): self { $this->append($field); return $this; } /** * @since 3.0.0 * @throws NameCollisionException */ public function subscriptionPeriod(Field $field): self { if ($this->subscriptionsEnabled){ $this->append($field); } return $this; } /** * @since 3.0.0 * @throws NameCollisionException */ public function subscriptionFrequency(Field $field): self { if ($this->subscriptionsEnabled){ $this->append($field); } return $this; } /** * @since 3.0.0 * @throws NameCollisionException */ public function subscriptionInstallments(Field $field): self { if ($this->subscriptionsEnabled){ $this->append($field); } return $this; } }